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A boat which has a speed of 5 km// hr ...

A boat which has a speed of `5 km// hr ` in steel water crosses a river of width ` 1 km` along the shortest possible path in `15` minutes. The velocity of the river water in ` km// hr` is

A

3

B

4

C

`sqrt21`

D

1

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The correct Answer is:
A
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