alleryA car covers the first 60 km at 30 km/h and the next 60 km at 60 km/h. What is the average speed for the whole journey?
A$40$ km/h
B$45$ km/h
C$48$ km/h
D$50$ km/h
Answer & Solution
Correct answer: A. $40$ km/h
Total distance = 120 km.
Time on first leg = 60/30 = 2 h.
Time on second leg = 60/60 = 1 h. Total time = 3 h.
Average speed = 120/3 = 40 km/h.
(Simple average 45 km/h is the trap.)
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