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Q.

A boat which has a speed of 5 km/h in still water crosses a river of width 1 km along the shortest possible path (zero drift) in 15min. The velocity of the river water in km per hour is

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a

4

b

41

c

3

d

1

answer is B.

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Detailed Solution

Net velocity of boat in river = 52−u2

t=DistanceVelocity⇒14=152−u2⇒u=3kmh−1

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