A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours Then the speed of boat in s...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of water current are respectively

4 kmph and 3 kmph

4.5 kmph and 0.5kmph

4 kmph and 2 kmph

5 kmph and 2 kmph

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Explanation:

Upstream speed, U = 24/6 = 12/3 = 4 km/h
Downstream speed , D = 20/4 = 5 km/h
Thus, Speed of boat in still water, x = (D + U)/2 = 9 / 2 = 4.5 km/h
Speed of water current, y = (D - U)/2 = ½ = 0.5 km/h