alleryA rider uses 40 km/h for the first half of the time and 60 km/h for the second half. What is the average speed?
A48 km/h
B50 km/h
C54 km/h
D52 km/h
Answer & Solution
Correct answer: B. 50 km/h
With equal times the average speed is the simple mean, (40 + 60) / 2 = 50 km/h.
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