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Mathematics for IGCSE & O level - Rates (Section 1 - No. 47)
A bus travels at 5 m/s on average. What is the speed in kilometers per hour?
15 km/h
18 km/h
20 km/h
25 km/h
解释
5 m/s * (3600 s/hour) / (1000 m/km) = 18 km/h
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