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Boats and Streams - General Aptitude

Q1:

Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:

A 16 hours

B 18 hours

C 20 hours

D 24 hours

ANS:D - 24 hours

Speed upstream = 7.5 kmph. Speed downstream = 10.5 kmph.

 Total time taken = 105 + 105 hours = 24 hours.
7.5 10.5