Discussion :: Boats and Streams

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:
Answer : Option D
Explanation :
Speed upstream = 7.5 kmph.
Speed downstream = 10.5 kmph.
Total time taken =[\( \frac { 1 05} { 7.5 }+\)\( \frac { 1 05} { 10.5 }]\)hours = 24 hours
Be The First To Comment