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Light travels at 2.998 X 10^8 meters/second

so, X 3

= 8.994 X 10^8 meter/second

Now to miles/hour

8.994 X 10^8 m/s (1 mile/1609 meters)(3600 seconds/1 hour)

= 2.0 X 10^9 miles per hour

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14y ago

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