A person covers equal distances at $40$ km/h and $60$ km/h. The average speed for the whole trip is:
Practice this question from Chapter Mock 8: Speed, Time and Distance, with options and an explanation.
Question
A person covers equal distances at $40$ km/h and $60$ km/h. The average speed for the whole trip is:
Option A
45 km/h
Option B — Correct answer
48 km/h
Correct choice.
Option C
50 km/h
Option D
52 km/h
Explanation
For equal distances, average speed $=\frac{2ab}{a+b}=\frac{2\times40\times60}{40+60}=48$ km/h.