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Speed of light c = 299792458 m/s × 1 km/1000 m = 299792.458 km/s.

Speed of light c = 299792.458 km/s × 3600 s/ 1 hr = 1079252848.8 km/hr.

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Q: What is the speed of light in kilometres?
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What travels at approximately 117 milloin kilometres an hour?

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