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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
28/3 hr
10 hr
12 hr
25/3 hr
Speed of man in still water, x = 3 km/h Speed of the stream, y = 2 km/hr. Upstream speed = x – y = 1 km/hr. Upstream time = Distance/ Upstream speed = 10 km/ 1 km/ hr. = 10 hr. downstream speed = x + y = 5 km/h Downstream time = Distance/ Downstream speed = 10 km / 5 km/h = 2 hours Total time = U.T + D.T = 10 hr. + 2 hr = 12 hours
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