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Ariver is flowing from west to east at a...

Ariver is flowing from west to east at a speed of 5 m/s. Aman on the south bank of the river capable of swimming at 10 m/s in a still water wants to swim, across the river in a shortest time He should swim in a direction

A

Due north

B

`30^(@)` east of west

C

`30^(@)` west of north

D

`60^(@)` east of north

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The correct Answer is:
A
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