Question

The speed of a boat in still water is 6.5km/h and the speed of the stream is 1.5 km per hour.A man rows the boat downstream for a certain distance and come back to the starting point. Find the Average speed for the whole journey ​

Answer 1

average speed formula,

= 2 X v1 X v2 / v1 + v2

v1 = 6.5 + 1.5,

8

v2 = 6.5 - 1.5,

4

average speed = 2 X 8 X 4 / 8 + 4

16/3

5.333