A person covers 1/3 of a distance at 15 km/h, 1/3 at 30 km/h and the last 1/3 at 60 km/h. Find the average speed.
A. 28 km/h
B. 25.71 km/h
C. 24 km/h
D. 30 km/h
Answer: Option B
Solution (By JKSSB Mock Tests)
Let each third of the distance be 60 km. Total distance = 180 km. Total time taken = 60/15 + 60/30 + 60/60 = 4 + 2 + 1 = 7 hours. Average speed = 180 / 7 = 25.71 km/h.
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