A person travels from city A to city B at 40 km/h and returns at 60 km/h. What is his average speed for the whole journey?

Topic: Speed, Time &amp; Distance
Subtopic: Harmonic Mean Speed

A48 km/h

B50 km/h

C52 km/h

D54 km/h

Explanation

Average speed = (2 * v1 * v2) / (v1 + v2) = (2 * 40 * 60) / (40 + 60) = 4800 / 100 = 48 km/h.

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