Time, Speed & Distance
Aptitude

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Q.

Rahul can row a certain distance downstream in 6 hour and return the same distance in 9 hour. If the speed of Rahul in still water is 12 km/hr, Find the speed of the stream.

 A.

2 km/hr

 B.

2.4 km/hr

 C.

3 km/hr

 D.

1.5 km/hr

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Solution:
Option(B) is correct

Let the speed of the stream be $x$ km/hr

Thus, downward stream = $(12+x)$

and upward stream = $(12−x)$

suppose the distance travelled be $y$, Given:

\(\dfrac{y}{12+x}=6\) and \(\dfrac{y}{12-x}=9\)

On solving these two equations we get:

$x$ = 2.4 km/hr


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