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20 March, 21:39

The speed of light is used to determine the length of a light-year. About how far does light travel in one second? A. 30 km B. 3,000 km C. 30,000 km D. 300,000 km

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  1. 21 March, 01:11
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    The answer would be D. 300,000 km/s
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