Sun	Mon	Tue	Wed	Thu	Fri	Sat
23	24	25	26	27	28	1
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9	10	11	12	13	14	15
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23	24	25	26	27	28	29
30	31	1	2	3	4	5

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Multiple Choice Questions

A man can row 7 5 kmph in still water If in a river running at 1 5 km an hour it takes him 50 ...........

Quantitative Aptitude and Numerical Ability (DRDO) (Phase-i and II) Boats and Streams

A man can row 7.5 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?

3 km

3.5 km

4 km

4.75 km

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Explanation:

Let the distance be x km.
Because, Speed of the man in still water = 712km/h712km/h
and speed of the river = 1.5 km/h
Therefore, Speed of the man downstream = 7.5 + 1.5 = 9 km/h
Speed of the man upstream = 7.5 - 1.5 = 6 km/h
According to the question, x9+x6=5060x9+x6=5060
=> 4x+6x36=50604x+6x36=5060
=> 10x60=506010x60=5060
=> x=50×3610×60=>x=3km

Hence, option 1 is the correct answer.

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