A motor boat whose speed is 15 km hour in still water goes 30 km down stream and comes back in a tot...........

Quantitative Aptitude (CDS) Boats and Streams

A motor boat, whose speed is 15 km/ hour in still water goes 30 km down-stream and comes, back in a total of 4 hour and 30 minutes. The speed of the stream is

4 km/hour

5 km/hour

6 km/hour

10 km/hour

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Explanation:

Let the speed of the stream be x km/hr
Time taken for upstream journey + Time taken for downstream journey = 4 hours 30 minutes

⇒225−x²=200
⇒x²=25
⇒x=5km/hr