A man can row 15 2 kmph in still water If in a river running at 1 5 km an hour it takes him 50 minut...........

Quantitative Aptitude (CDS) Boats and Streams

A man can row 15/2 kmph in still water. If in a river running at 1.5 km an hour, it takes him 50 minutes to row to a place and back, how far off is the place

2km

5km

1km

3km

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Explanation:

Let the distance be "x".
Speed downstream = ( 7.5 + 1.5 ) = 9 kmph
Speed upstream = (7.5 - 1.5 ) = 6 kmph
Let the required distance be x km. Then,
x/9 + x/6 = 50/60
2x + 3x = (5/6×18)
5x = 15
x = 3
distance = 3km