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CBSE Class 9 Answered

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
Asked by DiNesh B | 18 Sep, 2013, 08:12: PM
answered-by-expert Expert Answer

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

 
Answered by | 19 Sep, 2013, 12:51: PM

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