A boatman can row 4 Km along the stream in 20 minutes and return in 24 minutes Find the speed of boa...........

Quant (SSC) Boats and Streams

A boatman can row 4 Km along the stream in 20 minutes and return in 24 minutes. Find the speed of boatman in still water.

10 km/hr

8 km/hr

15 km/hr

11 km/hr

Downstream speed = 4/20 * 60 = 12 km/hr
Upstream speed = 4/24 * 60 = 10 km/hr
Speed of boatman = 1/2 (12+10) = 11 km/hr

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