Question
Wed September 18, 2013 By: Dinesh Kumar
 

a bus travels adistance of 120 km with a speed of 40 km/h and returns with aspeed of 30 km/h. calculate the average speed for the entire journey

Expert Reply
Thu September 19, 2013

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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