The average speed of a train running at a speed of 30 km hr during the first 100 kilometers at...........

Quantitative Aptitude ( CCS) Average

The average speed of a train running at a speed of 30 km/hr during the first 100 kilometers, at 40 km/hr during the second 100 kilometers and at 50 km/hr during the last 100 kilometers is nearly ?

38.5 km/hr

38.3 km/hr

40.0 km/hr

39.2 km/hr

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Explanation:

Time taken to cover first 100 kilometres = 100/30 = 3(1/3) hours
Time taken to cover second 100 kilometres =100/40 = 2(1/2) hours
Time taken to cover last 100 kilometres = 100/50 = 2 hours
Total distance covered = 300 km.
Total time taken = 47/6 hours
Thus, average speed = 300/(47/6) = 38.3 km/hr