A man rows downstream at 20 km hr and rows upstream at 15 km hr At what speed he can row in still wa...........

Quantitative Aptitiude (CLAT) Boats and Streams

A man rows downstream at 20 km/hr and rows upstream at 15 km/hr. At what speed he can row in still water?

17.5 km/hr

18 km/hr

20.5 km/hr

22 km/hr

Apply formula: Speed in still water = 1/2 (speed downstream + speed upstream)

Speed downstream = 20 km/hr

Speed upstream = 15 km/hr

∴ Required speed = 1/2 (20 + 15) km/hr

= 1/2 ∗ 35 = 17.5 km/hr

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