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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`

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