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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

1

B

3

C

4

D

`sqrt(41)`

Text Solution

Verified by Experts

The correct Answer is:
b
`|barV_(BR)|=5km /hr le t |barv RG |=u`
for shortest path `barv_(BG)` should be perpendicular to river flow `therefore 5 sin theta =u`

`u= 5 sin theta =5 xx3/5 =3 km/hr`
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