A bus travels a distance of 120 km with a speed of 40 km/h and returns with a speed of 30 km/h. Calculate the average speed for the entire journey.
Distance = 120 km speed= 40 km / hr speed = distance / time time = distance/ speed= 3 hour for return of train distance = 120 km speed = 30 km/ hr time = 4 hr average speed = total distance / total time taken = (120+120)/(3+4) =34.2 km / hr
