Question

Abdul while driving to school computes that his average speed is 20 km per hour on the return of his on the same route he compute that his average speed is 40 km per hour compute the average speed of Abdul for the whole journey

Answer 1

his initial velocity is 20 and his final velocity is 40.
=u+v/2
=20+40/2
=60/2
=30
answer

Answer 2

Hii..
Here is your answer..

Solution:-
Let the distance of one way be x.
1st Speed =20km/h
So,
Time 1st=D/T
$= > \frac{x}{20}$
Now,
Let Distance during second time also be x.
2nd Speed=30km/h
Time 2nd=
$= > \frac{x}{30}$
Since we know that,
$average \: speed = \frac{total \: distance}{total \: time \: taken}$
Here,
Total distance=Distance 1st+ Distance 2nd
$= > x + x \\ = > 2x$
Total time =Time 1st + Time 2nd
$= > \frac{x}{20} + \frac{x}{30}$
$= > \frac{3x + 2x}{60}$
$= > \frac{5x}{60}$
Therefore,
Average speed=
$= > \frac{2x}{ \frac{5x}{60} }$
$= > \frac{2x \times 60}{5x}$
$= > \frac{120x}{5x}$
$= > 24$
Hence,
Average speed=24km/h

Hope it helps uh...✌️✌️✌️