A boat goes 24 km upstream and 28 km downstream in 6 hours It goes 30km upstream and 21 km downstrea...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat goes 24 km upstream and 28 km downstream in 6 hours. It goes 30km upstream and 21 km downstream in 6 hours and 30 minutes. The speed of the boat in still water is

10kmph

4kmph

6kmph

8kmph

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Explanation:

speed of the boat in still water = x kmph
speed of the current = y kmph
upstream speed = (x – y) kmph
downstream speed = (x + y)kmph
24/(x-y) + 28/(x+y) = 6
30/(x-y) + 21(x+y) = 13/2
X = 10kmph