Question

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 1

Answer:

Speed upstream =9−1.5=7.5kmph

Speed downstream =9+1.5=10.5kmph

Total distance covered upstream=105km

Total distance covered downstream=105km

Time upstream=

7.5

105

=14hrs

Time downstream=

10.5

105

=10hrs

Total Time=14+10=24hrs