1. 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 a place 10 km upstream and back is :
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By: anil on 05 May 2019 01.57 am
Given that speed of swimmer = 3km/hr speed of river current = 2km/hr Speed of swimmer in upstream = (3-2) km/hr = 1 km/hr Speed of swimmer in downstream = (3+2) km/hr = 5 km/hr Distance to be covered upstream = Distance to be covered downstream =10 km So time taken in to and fro journey = $$frac{10}{3-2} + frac{10}{3+2}$$ = $$frac{10}{1} + frac{10}{5}$$ = 12 hour
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