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OpenStudy (anonymous):
the speed of light in a vacuum is 2.998 x10 8 m/s to km/hr
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Vocaloid (vocaloid):
use dimensional analysis there are 1000m in 1 km, so divide by 1000 to convert from m to km there are 3600 seconds in 1 hour, so multiply the previous result by 3600 to convert from seconds to hours your final result should be in km/hr
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