Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
🛶 SSC CGL, CHSL
Boats and Streams — formula, example and practice
Downstream = u+v, upstream = u−v. Do not swap still-water and current.
Content type: original worked example. Not labelled as a previous-year question.
Timed GK/quant mock Shortcuts CBSE Class 10 Maths 150 questions
Formula
Downstream = u+v · Upstream = u−v · u = (down+up)/2 · v = (down−up)/2
u is speed in still water, v is current.
What you should learn here
If time upstream and downstream are given for the same distance, you can solve for u and v directly from the two equations.
Worked example
Question. Downstream 15 km/h, upstream 9 km/h. Find still-water and current.
Solution. u = 12 km/h, v = 3 km/h.
Common mistake. Using u−v for downstream.
When to use the shortcut. Never apply boat formulas to ordinary road TSD.
Related chapters and tests
Time, Speed and Distance Simple Interest Percentage Ratio and Proportion All formulas SSC GD mocks SSC CGL mocks
150 important Boats and Streams 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
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 h.
Still water 8 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 10.
Still water 10 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: C
u−v = 7.
Downstream speed 16 km/h. Time to cover 64 km downstream (hours)
Answer / solution
Correct option: A
t = d/speed = 4 h.
Still water 14 km/h, current 2 km/h. Downstream speed is
Answer / solution
Correct option: B
u+v = 16.
Still water 16 km/h, current 3 km/h. Upstream speed is
Answer / solution
Correct option: B
u−v = 13.
Downstream speed 22 km/h. Time to cover 88 km downstream (hours)
Answer / solution
Correct option: D
t = d/speed = 4 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.
