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The width of river is 1 km. The velocity...

The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river with shortest possible path in 15 min. Then the velocity of river stream is:

A

3 km/h

B

4 km/h

C

`sqrt(29)` km/h

D

`sqrt(41)` km/h

Text Solution

Verified by Experts

The correct Answer is:
A
`v_("revolution") = (1 km)/(1//4 h) = (4 km/h)` `[therefore 15 min = 1/4 h]`
`therefore v_("River") = sqrt(5^(2) -4^(2)) =3 km//h`
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