Question

A car travels a t a speed of 40 km/h for 10 min, then 55 km/h for 20min, and finally at 20 km/h for 20 min. What is the average speed of the car?

Answer 1

avrege speed is =total distance/ total time taken
so avrege of the car is=40+55+20/10+20+20
=115km/50min.

=2.3km/min.
change into hour

so speed is equal approximately 139km/h