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Light travel in vacuum for approximately 300,000 km/second.

Hence, the speed of light in:

1 second= 300,000 km/second

1 minute= 18 000,000 km/minute

1 hour= 1.080 x 109 km/hour

1 day= 2.592 x 1010 km/day

1 year= 9.461 x 1012 km/year

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