Question

. In still water a man can swim 8 km in 1 hour.
But upstream he takes 4 times of that time to
cover the same distance. What is the speed of
the river current ?​

Answer 1

Answer: Since he makes his strokes normal to the river current, the movement of the river will have no effect on the time of crossing the bank.  

The time will be, T=  

Speed

Distance

​  

=  

4

1

​  

hr=0.25hr=15min.

In the same time, he will go down by  

Distance=Speed x time=3km/hr x 0.25hr=0.75km=750m

Step-by-step explanation: