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Light is so fast that it is usually expressed as about 300,000 kilometers per second. If you multiply that by 3600 seconds / hour, you get the speed in kilometers per hour.

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Q: How many kilometers per hour are in the speed of light?
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How many kilometers is in a light-hour?

1 light-hour = 1.07925285 × 109 kilometers.


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miles... in kph??? Anyway, the speed of light is 300,000 kilometers/second; you can convert that to whatever unit you want. For example, to convert to kilometers/hour, multiply by 3600.


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How many miles per hour does it take for light to travel from the sun to the earth?

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If 1 hour ===> 40 km, then 2 hours ===> 80 km.


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How many hour would it take to travel 135 kilometers?

That depends at what speed you are travelling.