A can finish a work in 6 days, B in 10 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (16)/(60); days ≈ 4.
🛠️ SSC CGL, CHSL, Railway
Time and Work — formula, example and practice
One-day work, efficiency and combined work — keep units consistent.
Content type: original worked example. Not labelled as a previous-year question.
Timed GK/quant mock Shortcuts CBSE Class 10 Maths 150 questions
Formula
If A does a job in d days, A’s 1-day work = 1/d · Combined = sum of 1-day works
Work is treated as 1 job. Efficiency is the reciprocal of days.
What you should learn here
Pipes and cisterns is this chapter with a tank of volume 1. An outlet is negative work.
LCM of days is a valid shortcut only to pick a convenient total-work number (for example 30 units), not a different theory.
Worked example
Question. A finishes in 10 days, B in 15 days. Days together?
Solution. 1/10 + 1/15 = 1/6. Together = 6 days.
Common mistake. Adding days (10+15) instead of adding work rates.
When to use the shortcut. Convert everyone to “work per day” before combining. Opposite workers (leak, destroy) get a minus sign.
Related chapters and tests
Average Pipes and Cisterns Percentage Ratio and Proportion All formulas SSC GD mocks SSC CGL mocks
150 important Time and Work 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
A finishes a work in 8 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: B
One day = 1/8 = 12%.
A: 10 days, B: 14 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 140/24 ≈ 6 days.
A can finish a work in 12 days, B in 16 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (28)/(192); days ≈ 7.
A finishes a work in 14 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/14 = 7%.
A: 16 days, B: 20 days. Approximate days if they work together
Answer / solution
Correct option: B
Product/sum = 320/36 ≈ 9 days.
A can finish a work in 18 days, B in 22 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: D
1/A+1/B = (40)/(396); days ≈ 10.
A finishes a work in 20 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/20 = 5%.
A: 6 days, B: 10 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 60/16 ≈ 4 days.
A can finish a work in 8 days, B in 12 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: A
1/A+1/B = (20)/(96); days ≈ 5.
A finishes a work in 10 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/10 = 10%.
A: 12 days, B: 16 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 192/28 ≈ 7 days.
A can finish a work in 14 days, B in 18 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (32)/(252); days ≈ 8.
A finishes a work in 16 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/16 = 6%.
A: 18 days, B: 22 days. Approximate days if they work together
Answer / solution
Correct option: D
Product/sum = 396/40 ≈ 10 days.
A can finish a work in 20 days, B in 24 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (44)/(480); days ≈ 11.
A finishes a work in 6 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: C
One day = 1/6 = 16%.
A: 8 days, B: 12 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 96/20 ≈ 5 days.
A can finish a work in 10 days, B in 14 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (24)/(140); days ≈ 6.
A finishes a work in 12 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/12 = 8%.
A: 14 days, B: 18 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 252/32 ≈ 8 days.
A can finish a work in 16 days, B in 20 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (36)/(320); days ≈ 9.
A finishes a work in 18 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/18 = 5%.
A: 20 days, B: 24 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 480/44 ≈ 11 days.
A can finish a work in 6 days, B in 10 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (16)/(60); days ≈ 4.
A finishes a work in 8 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: B
One day = 1/8 = 12%.
A: 10 days, B: 14 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 140/24 ≈ 6 days.
A can finish a work in 12 days, B in 16 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (28)/(192); days ≈ 7.
A finishes a work in 14 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/14 = 7%.
A: 16 days, B: 20 days. Approximate days if they work together
Answer / solution
Correct option: B
Product/sum = 320/36 ≈ 9 days.
A can finish a work in 18 days, B in 22 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: D
1/A+1/B = (40)/(396); days ≈ 10.
A finishes a work in 20 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/20 = 5%.
A: 6 days, B: 10 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 60/16 ≈ 4 days.
A can finish a work in 8 days, B in 12 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: A
1/A+1/B = (20)/(96); days ≈ 5.
A finishes a work in 10 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/10 = 10%.
A: 12 days, B: 16 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 192/28 ≈ 7 days.
A can finish a work in 14 days, B in 18 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (32)/(252); days ≈ 8.
A finishes a work in 16 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/16 = 6%.
A: 18 days, B: 22 days. Approximate days if they work together
Answer / solution
Correct option: D
Product/sum = 396/40 ≈ 10 days.
A can finish a work in 20 days, B in 24 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (44)/(480); days ≈ 11.
A finishes a work in 6 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: C
One day = 1/6 = 16%.
A: 8 days, B: 12 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 96/20 ≈ 5 days.
A can finish a work in 10 days, B in 14 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (24)/(140); days ≈ 6.
A finishes a work in 12 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/12 = 8%.
A: 14 days, B: 18 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 252/32 ≈ 8 days.
A can finish a work in 16 days, B in 20 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (36)/(320); days ≈ 9.
A finishes a work in 18 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/18 = 5%.
A: 20 days, B: 24 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 480/44 ≈ 11 days.
A can finish a work in 6 days, B in 10 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (16)/(60); days ≈ 4.
A finishes a work in 8 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: B
One day = 1/8 = 12%.
A: 10 days, B: 14 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 140/24 ≈ 6 days.
A can finish a work in 12 days, B in 16 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (28)/(192); days ≈ 7.
A finishes a work in 14 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/14 = 7%.
A: 16 days, B: 20 days. Approximate days if they work together
Answer / solution
Correct option: B
Product/sum = 320/36 ≈ 9 days.
A can finish a work in 18 days, B in 22 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: D
1/A+1/B = (40)/(396); days ≈ 10.
A finishes a work in 20 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/20 = 5%.
A: 6 days, B: 10 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 60/16 ≈ 4 days.
A can finish a work in 8 days, B in 12 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: A
1/A+1/B = (20)/(96); days ≈ 5.
A finishes a work in 10 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/10 = 10%.
A: 12 days, B: 16 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 192/28 ≈ 7 days.
A can finish a work in 14 days, B in 18 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (32)/(252); days ≈ 8.
A finishes a work in 16 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/16 = 6%.
A: 18 days, B: 22 days. Approximate days if they work together
Answer / solution
Correct option: D
Product/sum = 396/40 ≈ 10 days.
A can finish a work in 20 days, B in 24 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (44)/(480); days ≈ 11.
A finishes a work in 6 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: C
One day = 1/6 = 16%.
A: 8 days, B: 12 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 96/20 ≈ 5 days.
A can finish a work in 10 days, B in 14 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (24)/(140); days ≈ 6.
A finishes a work in 12 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/12 = 8%.
A: 14 days, B: 18 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 252/32 ≈ 8 days.
A can finish a work in 16 days, B in 20 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (36)/(320); days ≈ 9.
A finishes a work in 18 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/18 = 5%.
A: 20 days, B: 24 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 480/44 ≈ 11 days.
A can finish a work in 6 days, B in 10 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (16)/(60); days ≈ 4.
A finishes a work in 8 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: B
One day = 1/8 = 12%.
A: 10 days, B: 14 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 140/24 ≈ 6 days.
A can finish a work in 12 days, B in 16 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (28)/(192); days ≈ 7.
A finishes a work in 14 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/14 = 7%.
A: 16 days, B: 20 days. Approximate days if they work together
Answer / solution
Correct option: B
Product/sum = 320/36 ≈ 9 days.
A can finish a work in 18 days, B in 22 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: D
1/A+1/B = (40)/(396); days ≈ 10.
A finishes a work in 20 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/20 = 5%.
A: 6 days, B: 10 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 60/16 ≈ 4 days.
A can finish a work in 8 days, B in 12 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: A
1/A+1/B = (20)/(96); days ≈ 5.
A finishes a work in 10 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/10 = 10%.
A: 12 days, B: 16 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 192/28 ≈ 7 days.
A can finish a work in 14 days, B in 18 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (32)/(252); days ≈ 8.
A finishes a work in 16 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/16 = 6%.
A: 18 days, B: 22 days. Approximate days if they work together
Answer / solution
Correct option: D
Product/sum = 396/40 ≈ 10 days.
A can finish a work in 20 days, B in 24 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (44)/(480); days ≈ 11.
A finishes a work in 6 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: C
One day = 1/6 = 16%.
A: 8 days, B: 12 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 96/20 ≈ 5 days.
A can finish a work in 10 days, B in 14 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (24)/(140); days ≈ 6.
A finishes a work in 12 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/12 = 8%.
A: 14 days, B: 18 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 252/32 ≈ 8 days.
A can finish a work in 16 days, B in 20 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (36)/(320); days ≈ 9.
A finishes a work in 18 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/18 = 5%.
A: 20 days, B: 24 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 480/44 ≈ 11 days.
A can finish a work in 6 days, B in 10 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (16)/(60); days ≈ 4.
A finishes a work in 8 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: B
One day = 1/8 = 12%.
A: 10 days, B: 14 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 140/24 ≈ 6 days.
A can finish a work in 12 days, B in 16 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (28)/(192); days ≈ 7.
A finishes a work in 14 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/14 = 7%.
A: 16 days, B: 20 days. Approximate days if they work together
Answer / solution
Correct option: B
Product/sum = 320/36 ≈ 9 days.
A can finish a work in 18 days, B in 22 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: D
1/A+1/B = (40)/(396); days ≈ 10.
A finishes a work in 20 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/20 = 5%.
A: 6 days, B: 10 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 60/16 ≈ 4 days.
A can finish a work in 8 days, B in 12 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: A
1/A+1/B = (20)/(96); days ≈ 5.
A finishes a work in 10 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/10 = 10%.
A: 12 days, B: 16 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 192/28 ≈ 7 days.
A can finish a work in 14 days, B in 18 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (32)/(252); days ≈ 8.
A finishes a work in 16 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/16 = 6%.
A: 18 days, B: 22 days. Approximate days if they work together
Answer / solution
Correct option: D
Product/sum = 396/40 ≈ 10 days.
A can finish a work in 20 days, B in 24 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (44)/(480); days ≈ 11.
A finishes a work in 6 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: C
One day = 1/6 = 16%.
A: 8 days, B: 12 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 96/20 ≈ 5 days.
A can finish a work in 10 days, B in 14 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (24)/(140); days ≈ 6.
A finishes a work in 12 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/12 = 8%.
A: 14 days, B: 18 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 252/32 ≈ 8 days.
A can finish a work in 16 days, B in 20 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (36)/(320); days ≈ 9.
A finishes a work in 18 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/18 = 5%.
A: 20 days, B: 24 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 480/44 ≈ 11 days.
A can finish a work in 6 days, B in 10 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (16)/(60); days ≈ 4.
A finishes a work in 8 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: B
One day = 1/8 = 12%.
A: 10 days, B: 14 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 140/24 ≈ 6 days.
A can finish a work in 12 days, B in 16 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (28)/(192); days ≈ 7.
A finishes a work in 14 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/14 = 7%.
A: 16 days, B: 20 days. Approximate days if they work together
Answer / solution
Correct option: B
Product/sum = 320/36 ≈ 9 days.
A can finish a work in 18 days, B in 22 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: D
1/A+1/B = (40)/(396); days ≈ 10.
A finishes a work in 20 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/20 = 5%.
A: 6 days, B: 10 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 60/16 ≈ 4 days.
A can finish a work in 8 days, B in 12 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: A
1/A+1/B = (20)/(96); days ≈ 5.
A finishes a work in 10 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/10 = 10%.
A: 12 days, B: 16 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 192/28 ≈ 7 days.
A can finish a work in 14 days, B in 18 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (32)/(252); days ≈ 8.
A finishes a work in 16 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/16 = 6%.
A: 18 days, B: 22 days. Approximate days if they work together
Answer / solution
Correct option: D
Product/sum = 396/40 ≈ 10 days.
A can finish a work in 20 days, B in 24 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (44)/(480); days ≈ 11.
A finishes a work in 6 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: C
One day = 1/6 = 16%.
A: 8 days, B: 12 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 96/20 ≈ 5 days.
A can finish a work in 10 days, B in 14 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (24)/(140); days ≈ 6.
A finishes a work in 12 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/12 = 8%.
A: 14 days, B: 18 days. Approximate days if they work together
Answer / solution
Correct option: A
Product/sum = 252/32 ≈ 8 days.
A can finish a work in 16 days, B in 20 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: C
1/A+1/B = (36)/(320); days ≈ 9.
A finishes a work in 18 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: D
One day = 1/18 = 5%.
A: 20 days, B: 24 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 480/44 ≈ 11 days.
A can finish a work in 6 days, B in 10 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (16)/(60); days ≈ 4.
A finishes a work in 8 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: B
One day = 1/8 = 12%.
A: 10 days, B: 14 days. Approximate days if they work together
Answer / solution
Correct option: C
Product/sum = 140/24 ≈ 6 days.
A can finish a work in 12 days, B in 16 days. Together they finish it in (nearest whole day)
Answer / solution
Correct option: B
1/A+1/B = (28)/(192); days ≈ 7.
A finishes a work in 14 days. A’s one-day work as a percent of the whole is
Answer / solution
Correct option: A
One day = 1/14 = 7%.
A: 16 days, B: 20 days. Approximate days if they work together
Answer / solution
Correct option: B
Product/sum = 320/36 ≈ 9 days.
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