The speed of a boat in still water is 7 km hr and the speed of the stream is 3 km hr A man rows to a...........

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The speed of a boat in still water is 7 km/hr and the speed of the stream is 3 km/hr. A man rows to a place at a distance of 60 km and comes back to the starting point. Find the total time taken by him?

17 hrs

20 hrs

21 hrs

15 hrs

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Explanation:

Speed of boat = 7 km/h,
speed of stream = 3 km/h
Total time = Distance /Downstream speed + Distance /Upstream speed
= 60 /(7 + 3) + 60 /(7 - 3)
= 60 /10 + 60/4
= 6 + 15 = 21 hours