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A car covers half a journey at 40 km/h and the other half at 60 km/h. Average speed for the whole journey:
A48 km/h
B50 km/h
C45 km/h
D52 km/h
Answer & Solution
Correct answer: A. 48 km/h
1. Average speed for equal distances = 2ab/(a+b).
2. = 2 × 40 × 60 / 100.
3. = 48 km/h.
_Source: jkchrome TSD QB, p.4 — harmonic mean_
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