Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
🚰 SSC CGL, CHSL
Pipes and Cisterns — formula, example and practice
Inlet/outlet work with opposite signs. Same engine as time and work.
Content type: original worked example. Not labelled as a previous-year question.
Timed GK/quant mock Shortcuts CBSE Class 10 Maths 150 questions
Formula
Net fill per hour = 1/A + 1/B − 1/C (C is the leak)
Same as time and work. Inlets positive, outlets negative.
What you should learn here
Keep the tank volume as 1 unless the question gives litres — then use litres throughout.
Worked example
Question. Pipe A fills in 12 h, leak empties in 18 h. Time to fill together?
Solution. 1/12 − 1/18 = 1/36. Time = 36 hours.
Common mistake. Treating the leak as another inlet.
When to use the shortcut. If the leak is opened only after the tank is half full, split the timeline into two stages.
Related chapters and tests
Time and Work Time, Speed and Distance Percentage Ratio and Proportion All formulas SSC GD mocks SSC CGL mocks
150 important Pipes and Cisterns questions
Original arithmetic practice for this page. Not labelled as previous-year SSC/railway items. Tap an option to mark it. Open “Answer” for the working.
Score: 0 / 0
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
Inlet fills in 8 h, outlet empties in 12 h. Both open, tank fills in
Answer / solution
Correct option: A
Net = 1/8−1/12 = 4/(96); time = 24 h.
Inlet fills in 10 h, outlet empties in 14 h. Both open, tank fills in
Answer / solution
Correct option: D
Net = 1/10−1/14 = 4/(140); time = 35 h.
Inlet fills in 12 h, outlet empties in 16 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/12−1/16 = 4/(192); time = 48 h.
Inlet fills in 14 h, outlet empties in 18 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/14−1/18 = 4/(252); time = 63 h.
Inlet fills in 16 h, outlet empties in 20 h. Both open, tank fills in
Answer / solution
Correct option: B
Net = 1/16−1/20 = 4/(320); time = 80 h.
Inlet fills in 18 h, outlet empties in 22 h. Both open, tank fills in
Answer / solution
Correct option: C
Net = 1/18−1/22 = 4/(396); time = 99 h.
FAQs
Are these previous-year SSC questions?
No year or shift is claimed on these pages. Each maths section has 150 original practice MCQs. When a verified source database exists, a question will show exam + year; until then it is practice.
Where are Class 10 board formulas?
The CBSE formula sheet at /cbse/class-10/mathematics/formulas/ stays the canonical board list. This maths hub links to it instead of copying every line.
Do you publish tricks that are only sometimes true?
Every shortcut page states when the trick must not be used. A speed trick that fails on close options is not published as if it were a theorem.
