A man can row a boat at 25/9 meters per second in still water and the speed of the stream is 8 kmp

M4maths Previous Puzzles

11 Mar 2020 Boats and Streams

A man can row a boat at 25/9 meters per second in still water and the speed of the stream is 8 kmph. What is the
time taken (in hours) to row a distance of 90 km down the stream ?

OPtion

1) 20
2) 5
3) 15
4) 16
5) 25
6) 6
7) 8
8) 7
9) 10
10) None of these

Solution

Speed in down stream = 10 +8 = 18

Time taken to cover 90 km down stream = 90/18 = 5 hrs.

Correct Option: 2 Best Solution (3)