A man can swim 3 km/hr in still water . If the velocity of the stream is 2 km/hr the time taken by him to swim to place 18 km upstream and back is
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while moving upstream relative vel = 3+2 = 5 km/hr
then in this case
t1 = 18 /5 hr
moving back relative vel = 3-2 = 1 km/hr
t2 = 18/1 he
total time = t1+ t2
18/5+18/1 = 21.6 hr
then in this case
t1 = 18 /5 hr
moving back relative vel = 3-2 = 1 km/hr
t2 = 18/1 he
total time = t1+ t2
18/5+18/1 = 21.6 hr
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