Vb = 40km/2h = 20 km/h. Downstream.
Vb = 40km/4h = 10 km/h. Upstream.
Vb = (20+10)/2 = 15 km/h. In still water.
Vs = 20 - 15 = 5 km/h. = Velocity of the stream.
A boat takes 2 hours to go 40 km down the stream and it returns in 4 hours . Find the speed of the boat in still water and the speed of the stream
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