A boat whose speed in 15 km hr in still water goes 30 km downstream and come back in a total of 4 ho...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat whose speed in 15 km/hr in still water goes 30 km downstream and come back in a total of 4 hours 30 minutes. What is the speed of the stream (in km/hr)?

5 km/hr

7 km/hr

7.5 km/hr

None of these

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Explanation:

Let the speed of stream be x km/hr,

30/(15-x) +30/(15+x) = 4.5

450-30x +450+30x = 4.5(225-x2)

900/4.5= 225 - x2

200-225 = -x2

X = 5km /hr

Hencce, option 1 is the correct answer.

By: Amit Kumar

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A boat whose speed in 15 km hr in still water goes 30 km downstream and come back in a total of 4 ho...........

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Explanation:

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