Question

a car travels certain distance with a speed of 50kmh-¹ and returns with a speed of 40kmh-¹. calculate the average speed of whole journey​

Answer 1

Answer:

50 km/h

=50×1000/1×60×60

=125/9 m/s

40 km/h

=40×1000/1×60×60

=100/9 m/s

First Distance= 125m in 9s

Second Distance= 100m in 9s

Avg.Speed= total S/total T

=125+100/9+9 m /s

=225/18 m/s

=12.5 m/s