Question

speed of boat in still water is 5 kilometre per hour and speed of stream is 1 kilometre per hour. the boat is rowed of him for a certain distance and taken back to the starting point find the average speed for the whole journey​. { I wil ark you as brainliast{

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