Asked by yeung

The speed of a boat in still water is 8km/h. It travels upstream for a distance of 1.5km and returns(downstream) to the starting point. If the whole trip takes 2/5 hours, find the speed of the stream flow.
Answered by Steve
Since time = distance/speed,

1.5/(8-s) + 1.5/(8+s) = 0.4
s = 2
Answered by dorcas
7.1km/hr
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