Question

the speed of a boat in still water is 5 km/h. It can go 5 km upstream and 20 km downstream in 5 hours. Find the speed of the stream.​

Answer 1

Answer:

Let distance be x km

Speed downstream = 5+2 = 7 km /hr.

Speed upstream = 5-2 = 3 km/hr.

So

3

x

−

7

x

=2

7x−3x=2×21

4x = 42

x=

4

42

=10.5 km/h