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A car covers 60 km at 30 km/h and the next 60 km at 60 km/h. Its average speed is
A45 km/h
B50 km/h
C30 km/h
D40 km/h
Answer & Solution
Correct answer: D. 40 km/h
Time is 2 h + 1 h = 3 h for 120 km, so the average speed is 40 km/h, not the simple mean.
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