Question

Abdul while driving to school computes the average speed of his trip to be 20 km per hour on his return trip along the same route there is less traffic and the average speed of 40 km per hour what is the average speed of Abdul strip​

Answer 1

Explanation:

Given-

Let the distance =x

And total distance=2x

Speed for going=20km/h

Speed of returning=40km/h

A.V.Speed=?

Time for 1st journey=t1=distance/speed

t1=x/20

Time for 2nd journey=t2=distance/speed

t2=x/40

Total Time=t1+t2

=x/20+x/40

=(2x+x)/40

=3x/40

Average speed=Total distance/Total time

=2x/3x/40

=2x×40/3x

=80/3

=26.7 km/h approx.