A river is flowing from west to east at a speed of 5 m/min. a man who can swim at the rate of 10m/min in still water , is standing on the south bank of the river . he wants to swim across the river in the shortest time.he should swim in a direction:a) due north b) 30 degree east of north c) 30 degree west of north d) 60 degree east of north.
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30 degree east ...if he goes 30 than covers distance in minimum time
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Ans is( c )because if we imagine to travel straight towards north ,then we will get tilt to travel 30°north east
So to travel straight,we will travel 30°towards west by this, river will automatically alighn us to 90°till we reach the another bank
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