It is equal to 299 792 458 m s 1 value adopted by the IAU in 1976. So we often use scientific notation to represent large values as well as small values Now to represent 300000000 ms to scientific notion 3 100000000 ms 310⁸ ms Where 8 is exponent. The speed of light in free space that is in a vacuum is a constant that has been measured to considerable accuracy.
Kilometres per hour kmhKilometres per second kmsKnots knotMetres per second msMillimetres per second mmsMiles per hour mphMicrometres per second µmsSpeed of lightFeet per secondMiles per secondSpeed of sound Speed of light Kilometres per hour Precision.
Ms or speed of light The SI derived unit for speed is the metersecond. Also they used to define one second as 186400 of a solar day so that the day may be divided to 24 hours each containing 60 minutes per 60 seconds. Auto 2 3 4 5 6 7 8 9 10 12 14 16 18 20decimal digits. That works out to 299792458 ms or about 670616629 mph miles per hour.