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A train 120 m long crosses a pole in 6 seconds. Its speed is?

1. 72 km/h
2. 60 km/h
3. 20 km/h
4. 36 km/h

Correct answer: 72 km/h

Solution

The train covers 120 m in 6 s, so speed = 120/6 = 20 m/s. Converting to km/h: 20 × 3.6 = 72 km/h.

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