Question:

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.

Updated On: Sep 25, 2024
  • 1.5 km/hr
  • 2 km/hr
  • 2.5 km/hr
  • 1.75 km/hr
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The Correct Option is A

Solution and Explanation

Given that the speed in still water (u) = 4.5 km/hr
\(\frac{d}{u-v}\) = 2 \(\frac{d}{u+v}\)
From Equating both the equation, we get
2u - 2v = u + v
u = 3v
v = \(\frac{u}{3}\)
v = 4.5/3
v = 1.5 km/hr
The correct option is (A)
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