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

A river is flowing from west to east at a speed of 5 metres per minute. A man on the south block of the river capable of swimming at 10 metres per minute in still water, wants to swim across the river in shortest time, he should swim in the direction.

A

due north

B

`30^@`east of north

C

`30^@` west of north

D

`60^@` easr of north

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The correct Answer is:
A
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