A car covers four successive 7 km distances at speeds of 10 km hour 20 km hour 30 km hour and 60 km ...........

Quant (SSC) Time & distance

A car covers four successive 7 km distances at speeds of 10 km/hour, 20 km/hour, 30 km/hour and 60 km/hour respectively. Its average speed over this distance is :

40 km/hr

20 km/hr

30 km/hr

50 km/hr

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Explanation:

Time taken at 10 km/hour = 7/10 hr
Time taken at 20 km/hour = 7/20 hr
Time taken at 30 km/hour = 7/30 hr
Time taken at 60 km/hour = 7/60 hr
Total time taken = 7/10 + 7/20 + 7/30 + 7/60 = 7/5 hr
= Average speed = 7 x 4 / 7/5 = 20 km/hour