Discussion

Question:

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

Explanation:

Total time taken = $(\frac{60}{10} + \frac{60}{20} + \frac{60}{30} + \frac{60}{60})$ = 12 hrs.

Avg. speed = $\frac{240}{12}$ = 20 km/h.

Hence, option (b).

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