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A train covers 216 km in 3 hours. What is its average speed in metres per second?

1. 29 m/s
2. 30 m/s
3. 20 m/sec
4. 25 m/s

Correct answer: 20 m/sec

Solution

The train’s speed is 216 ÷ 3 = 72 km/h. Converting to m/s: 72 × 5/18 = 20 m/s.

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