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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.
Answer & Solution
Correct Answer:
Option
D
$$\eqalign{
& {\text{Average speed}} = \frac{{{\text{Total distance}}}}{{{\text{Total time}}}} \cr
& = \frac{{210 + 198}}{{\frac{{210}}{{60}} + \frac{{198}}{{66}}}} \cr
& = 62.769 \cr
& = 62.8\,{\text{km/hr}} \cr} $$
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