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A motorist travels from A to B at a speed of 40 km/hr and returns back at a speed of 60 km/hr. His average speed will be:

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40 km/hr

48 km/hr

5 0 km/hr

6 0 km/hr

answer is B.

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Detailed Solution

$Average speed of motorist = \frac{s + s}{\frac{s}{40} + \frac{s}{60}} = \frac{2 (40) (60)}{40 + 60}$
= 48 km/hr

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