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Boats and Streams - General Aptitude

Q1:

A boat covers a certain distance downstream in 1 hour, while it comes back in 1 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water?

A 12 kmph

B 13 kmph

C 14 kmph

D 15 kmph

E None of these

ANS:D - 15 kmph

Let the speed of the boat in still water be x kmph. Then, Speed downstream = (x + 3) kmph, Speed upstream = (x - 3) kmph.

 (x + 3) x 1 = (x - 3) x 3
2
 2x + 6 = 3x - 9  x = 15 kmph.