A boat covers a certain distance downstream in 2 hour while it comes back in 2 1 2 hours If the spee...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat covers a certain distance downstream in 2 hour, while it comes back in 2 1/2 hours. If the speed of the stream be 5 kmph, what is the speed of the boat in still water?

40 kmph

30 kmph

35 kmph

45 kmph

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Explanation:

Let the speed of the boat in still water be x kmph. Then,
Speed downstream = (x + 5) kmph,
Speed upstream = (x – 5) kmph.
(x + 5)*2 = (x – 5)*5/2
X = 45 kmph