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A man who can swin at the rate of 2 (km)...

A man who can swin at the rate of 2 `(km)/hr)`(in still river) crosses a river to a point exactly opposite on the other bank by swimming in a direction of `120^@` to the flow of the water in the river. The velocity of the water current in `(km)/(hr)` is

A

1

B

3

C

`(1)/(2)`

D

`(3)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A

Let speed of current be u. For net velocity ofman to be normal to river flow.
normal to river flow.
`2cos60^@=u`
or `u=1(km)/(hr)`
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