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# The speed of light in a vacuum is 2.998 x 10⁸ m/s. What is the speed in km/hr?

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- MyRankLv 62 months ago
Given,

Speed of light in vacuum (c) = 2.998 x 10⁸m/s

Now, convert m/sec into km/hr

2.998 x 10⁸m x 1km x 3600sec / sec x 10³m x 1hr = (2.998 x 10⁸ x 1 x 3600 / 10³ x 1) km/hr = 10792.8 x 10⁸⁻³km/hr = 10792.8 x 10⁵km/hr ≈ 1.08 x 10⁹km/hr

∴ Speed (v) = 1.08 x 10⁹km/hr.

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- electron1Lv 76 months ago
The following conversion factors are used to convert km/h to m/s

1 km = 1000 m

1hr = 3600 s

1km/h = 1000/3600 = 5/18 m/s

Since you need to convert m/s to km/h, invert this fraction.

1 m/s = 18/5 = 3.6 m/s

To convert m/s to km/h, multiply 3.6.

v = 2.99 * 10^8 * 3.6 = 1.08 * 10^9 km/h

I hope this is helpful for you.

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- billrussell42Lv 76 months ago
actually it is 299,792,458 m/s exactly

299,792,458 m/s x 1 km/1000 m x 3600 s/hr = 1 079 252 848.8 km/hr

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- Anonymous6 months ago
Use google to convert from one unit to another.

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