Question

A car drives from A to B with a uniform speed of 30 km per hour and returns back with the speed of 20 kilometre per hour find its average speed​

Answer 1

Explanation:

Let the Distance between A and B be x

Time taken from A to B, t

1

=

30

x

Time taken from B to A, t

2

=

20

x

Total time =t

1

+t

1

=

30

x

+

20

x

=

60

5x

Average speed =

total time

total distance

=

60

5x

x+x

=

60

5x

2x

=24 kmh

−1