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Question 56
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 the stream.
Solution
Given u (still water speed) = 4.5 km/hr
d/u-v = 2 d/u+v
2u - 2v = u + v
u = 3v
v = u/3 = 4.5/3 = 1.5 km/hr
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