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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
b. Net velocity of boat in river `= sqrt(5^2 -u^2)`
`t = Distance/ Velocity rArr 1/4 = 1/(sqrt(5^2-u^2)) rArr u = 3 kmh^(-1)` .
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