A man travels 210 km with the speed of 60 km...

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A man travels 210 km with the speed of 60 km/hr and next 198 km with the speed of 66 km/hr. Find the average speed of the whole journey.

A. 68.5 km/hr

B. 64.5 km/hr

C. 63 km/hr

D. 62.8 km/hr

Answer: Option D

Solution (By Examveda Team)

$$\eqalign{ & {\text{Average speed}} = \frac{{{\text{Total distance}}}}{{{\text{Total time}}}} \cr & = \frac{{210 + 198}}{{\frac{{210}}{{60}} + \frac{{198}}{{66}}}} \cr & = 62.769 \cr & = 62.8\,{\text{km/hr}} \cr} $$

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