Question

A train travels some distance with a speed of 30km/h and returns with a speed of 45km/h.Calculate the average speed of the train.

Answer 1

average speed = total distance / total time
= (30+45) km / 2hr
= 75 / 2
= 37.5 km/hr is the average speed of the train.

Answer 2

total distance=30+45=75km                                                                                  total time=2hr
total speed=total distance covered/total time
                   =75/2
                   =37.5km/hr