Physicsmedium · Past Paper
A train travels at a speed of 60 km/h for 0.52 h, at 30 km/h for the next 0.24 h and then at 70 km/h for the next 0.71 h. What is the average speed of the train?
A59.9 km/h
B53.3 km/h
C64.2 km/h
D45.5 km/h
✓ Correct Answer: A — 59.9 km/h
Total distance = (60*0.52)+(30*0.24)+(70*0.71) = 31.2 + 7.2 + 49.7 = 88.1. Total time = 0.52+0.24+0.71 = 1.47. Avg speed = 88.1/1.47 ≈ 59.9.
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