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Question

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


A

Due north

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B

30 east of north

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C

30 west of north

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D

60 east of north

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Solution

The correct option is A

Due north


For minimum time, the swimmer should swim perpendicular to the direction of river flow. So, he should swim due north.


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