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A train 125 m long passes a man running at 5 km/h in the same direction as the train in 10 seconds. The speed of the train is:

1. 45 km/hr
2. 50 km/hr
3. 54 km/hr
4. 55 km/hr

Correct answer: 50 km/hr

Solution

Since the man and train move in the same direction, relative speed = train speed − man speed. The train covers 125 m in 10 s, so relative speed is 12.5 m/s = 45 km/h; adding the man's 5 km/h gives 50 km/h.

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