Question

A car travelled with a speed of 72 km / h from A to B and in returning from B to A the car travelled at a speed of 108 km /h . Find average speed of the car .​

Answer 1

90 km/h

Explanation:

Average Speed = Total Distance / Total Time

72+108= 180/2x

2x = Let's Take Distance From A to B as x

And From B to A as x, So x+x = 2x

Average Speed = 90 km/h

Answer 2

Answer:

time =distance /speed

let the distance =x(A to B )

from B to A =x ,so total =2x

T1=x/20

T2=x/300(m/S)

average speed =total distance /total time

=2x/x/20+x/300

after solving this answer will be =37.5 m/s