A man can row 4.5 km/hr in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of stream.
Let's assume stream speed = x
Man's Speed = 4.5
Upstream Speed = 4.5 - x
Download Speed = 4.5 + x
Downstream Time : Upstream Time = 1 : 2
Downstream Speed : Upstream Speed = 2 : 1
(4.5 - x)/(4.5 + x) = 1/2
9 - 2x = 4.5 + x
3x = 4.5 => x = 1.5
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