Question

a car car travels a straight line for the first half with a speed of 40 km per hour and the second half with the speed of 60 km per hour find the average speed?

Answer 1

First half hour speed=40 km
Second half hour speed=60 km

Average speed= Sum of observations/No. of observations

Average speed= 40+60/2
= 100/2
= 50
Therefore, average speed is 50 km per hour.

Answer 2

First half = 60 km
Second half = 40 km
Total time = 2 h
average speed = 60+ 40/2
= 100/2 = 50 km/h