alleryA bus travels equal distances at 40 km/h and 60 km/h. What is the average speed for the whole journey?
A$50$ km/h
B$45$ km/h
C$48$ km/h
D$52$ km/h
Answer & Solution
Correct answer: C. $48$ km/h
Equal-distance legs use harmonic mean: 2ab/(a+b) = 2 × 40 × 60 / (40+60) = 4800/100 = 48 km/h.
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