Question

abdul while driving to school computes average speed 40 km/h and return 20 km/h what is his average speed

Answer 1

Hey Dear Here is your answer ☺

⭐Let the distance of the school from Abdu;l's home to school be s km

⭐Let the time from home to school be t1

⭐Let the time between return journey be t2

⭐Therefore Average Speed = s / t1 = 20 km /hr ⭐so t1 = s / 20 hrs.

⭐and similarly s / t2 = 30 km / hr so t2 = s / 30 hrs.

⭐Total distance covered is s + s = 2s km.

⭐Total time =(s / 20 + s/ 30 ) hrs

2s / s( 1 / 20 + 1 / 30) h

2 * 20 * 20 / 30 + 20

= 2 * 20 * 20 * 30 / 50

= 24 km /hr.

⭐The average speed is 24 km .hr

Hope it helped you out ⭐^_^⭐
Thanks ⭐(^^)⭐

Answer 2

Hi,

Given
The speed of Abdul while arriving = 40 km/h
The speed of Abdul while returning = 20 km/h
We all know that
average = sum of observations/no. of observations

In the same way
average speed = sum of total speeds/no. of speeds
                           = 40 +20 /2
                           = 60/2
                           = 30 km/h

The average speed of Abdul is 30Km/h

Hope this helps you.