alleryThree equal legs of a trip are driven at 20, 30 and 60 km/h. What is the average speed for the full trip?
A40 km/h
B35 km/h
C30 km/h
D25 km/h
Answer & Solution
Correct answer: C. 30 km/h
Harmonic mean: 3 / (1/20 + 1/30 + 1/60) = 3 / (1/10) = 30 km/h.
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