Railway Recruitment Board Mathematics — Question 1721
Question
A man covers a distance at 40 km/h and returns along the same route at 60 km/h. What is his average speed for the whole journey?
- 50 km/h
- 45 km/h
- 48 km/h
- 52 km/h
Correct answer
C — 48 km/h
Explanation (English)
For equal distances, average speed = 2ab/(a+b) = 2×40×60/(40+60) = 4800/100 = 48 km/h.
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