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A river is flowing from east to west at ...

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

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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