To convert a speed from km/h to m/s, we multiply it by

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• A 7/9
• B 18/5
• C 9/5
• D 5/18

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Answer: D. 5/18

1 km = 1000 m and 1 h = 3600 s, so 1 km/h = 1000/3600 m/s = 5/18 m/s.

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