a bus travels a distance of 120 km with a speed of 40 km per hour and returns with a speed of 30 km per hour calculate the average speed for the entire journey
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Average speed = Total distance travelled / Total time taken
Total Distance Travelled = 120+120 = 240 km
Time taken for going = Distance/ Speed = 120/40 = 3 hrs
Time taken for return = Distance/ Speed = 120/30 = 4hrs
Thus, total time taken = 3+4 = 7 hrs
Average speed = 240 / 7 = 34.3 km/h
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