Question
A man rows to a place 42 km away and comes back to the
starting point. If the speed of the stream is 2 km/hr and the speed of the boat in still water is 5 km/hr. Then what is the total time taken by him?Solution
=> 42/(5 + 2) + 42/(5 - 2) => 6 + 14 = 20 hrs
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