How long will it take to row 20 km upstream if one can row 10 km in 10 minutes in still water and th...........

Quant (SSC) Boats and Streams

How long will it take to row 20 km upstream if one can row 10 km in 10 minutes in still water and the same distance in 8 minutes with the stream?

12 min

13.33 min

24 min

26.67 min

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Explanation:

Let x be the speed of man in still water and y be the speed of stream.
∴ Speed of man (x) = 60 km/hr and speed of downstream = 75 km/hr.
∴ Speed of stream = 15 km/hr.
Hence upstream speed = 60 – 15 = 45 km/hr.
So time taken to cover 20 km = 20/45*60 = 26.67min.

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