A man covers three equal distances at 10 km/h, 20 km/h and 60 km/h. What is his average speed for the whole journey?
A. 30 km/h
B. 18 km/h
C. 24 km/h
D. 20 km/h
A. 30 km/h
B. 18 km/h
C. 24 km/h
D. 20 km/h
Best answer
Answer: B. 18 km/h
Answer: (B) 18 km/h
Take each distance = 60 km (LCM). Times = 6 h + 3 h + 1 h = 10 h for 180 km.
Average speed = 180 ÷ 10 = 18 km/h.
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