A man can swim 3 kmph in still water. If the velocity of the stream be 2 kmph, the time taken by him to swim to a place 10 km upstream and back, is
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Speed of man in still water, x =3 km/hr.
Speed of the stream, y = 2 km/hr.
Upstream speed = x−y = 1 km/hr.
Upstream time
=DistanceUpstream speed
=10 km1 km/hr=10 hr
Downstream speed
=x+y=5 km/h
Downstream time
=DistanceDownstream speed
=10 km5 km/hr=2 hr
Total time=U.T+D.T
=10 hr+2 hr
=12 hrs
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