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A man rows a boat 18 km in 4 hours downstream and returns upstream in 12 hours, the speed of the stream in km/hr is

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1.75

1.5

answer is B.

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Detailed Solution

Rate downstream

= \frac{18}{4} = \frac{9}{2} kmph

Rate upstream $= \frac{18}{12} = \frac{3}{2} kmph$

Speed of stream $= \frac{\frac{9}{2} - \frac{3}{2}}{2}$

$= \frac{9 - 3}{4}$

$= \frac{6}{4}$

$= \frac{3}{2}$

$= 1.5 kmph$

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