Question

A bus travel a distance of 120 km with a speed of 40 km per hour and return at a speed of 30km per hour .calculate the average speed

Answer 1

Average speed = initial speed+ final speed / 2
= 40+30÷ 2
= 35 km per hour..........

Answer 2

Average speed = Total distance /Total time
Total distance = 240 km
Total time = 120/40 + 120/30 = 3 + 4 = 7hr
So Average velocity = 240/7 = 34.28 km/hr.