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:

Correct option is

A

3.2 km/hr

Speed of man is y 9.6km.hr

let speed of stream is x km/hr

then, speed of down stream −(9.6−x)km/hr

Speed of upstream=(9.6−x)km/hr

As distance up stream same

9.6+x=(9.6−x)2

9.6+x=19.2−9.6

x=

3

9.6

=3.2km/hr