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A boat which has a speed of 5kmh^(-1) in...

A boat which has a speed of `5kmh^(-1)` in still water crosses a river of width 1 km along the shortest possible path in 15 min. The velocity of the river water in `km h^(-1)` is

A

1

B

3

C

4

D

`sqrt4 l`

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The correct Answer is:
B
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