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The speed of boat is 5 kmh^(-1) in still...

The speed of boat is `5 kmh^(-1)` in still water. It crosses a river of width 1 km along the shortest possible path in 15 min. Then, velocity of river will be

A

5

B

1

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
C
The resultant velocity of boat and river `=(1.0 km ) /(0.25 h) = 4 km//h`
Velocity of river = `sqrt(5^(2) -4^(2)) = 3` km/h
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