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An athlete runs a 400-meter race in 32 seconds. His speed in km/h is:

1. 45 km/h
2. 40 km/h
3. 48 km/h
4. 50 km/h

Correct answer: 45 km/h

Solution

Speed = 400/32 = 12.5 m/s. Converting to km/h: 12.5 × 18/5 = 45 km/h.

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