Rahul can row a certain distance downstream in 12 hour and return the same distance in 18 hour If th...........

Quantitative Aptitude(Banking) Boats and Streams

Rahul can row a certain distance downstream in 12 hour and return the same distance in 18 hour. If the speed of Rahul in still water is 12 kmph, find the speed of the stream?

2.1 kmph

1.5 kmph

4.4 kmph

2.4 kmph

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Explanation:

Option D
Solution:
Let the speed of the stream be x kmph
Down stream = (12+x)
Up stream = (12−x)
suppose the distance traveled be y
y/(12+x) = 12 —(1)
y/(12−x)= 18 —-(2)
From eqn (1) and (2)
x= 2.4 kmph