Question

A car covers half of the distance with speed 60km/hr and rest of the half with 30km/hr the average speed of the car is

Answer 1

let the total distance be 'd'

half of the distance=d/2

speed=60

time=d/s=d/120s


rest half of the distance=d/2

speed = 30

time=d/60


so total time=d/120 + d/60 =d/40
total distance we know 'd'


average speed=total distance/total time
                        =d/d/40=40km/h