A person can row 7 1 2 km an hour in still water Finds that it takes twice the time to row upstream ...........

Quantitative Aptitude ( CCS) Boats and Streams

A person can row 7 1/2 km an hour in still water. Finds that it takes twice the time to row upstream than the time to row downstream. The speed of the stream is:

1.5km/hr

2km/hr

4km/hr

2.5km/hr

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Explanation:

Solution:
Let the distance covered be x km and speed of stream = y kmph.
Speed downstream = (15/2)+y
Speed upstream = (15/2)-y
[2x/((15/2)+y)] = [x/((15/2)-y)]
15-2y = (15/2)+y
3y = 15-(15/2) = 15/2
y = 15/6 = 2.5 kmph.