Question

a river is flowing from west to east at a speed of 5 metre per minute in what direction should a man on the South Bank of the river capable of swimming at 10 metre per minute still in water should swim to cross the river in shortest time

please tell this answer with proper explanation

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Answer 1

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This is because the velocity of the river is west to east and there are no components in north-south. So, it will not affect the man's time in order to swim to the other bank. Hence, the swimmer should swim due north.