Convert from kilometer/hour to speed of light [vacuum]

Unit Definition (kilometer/hour)
The kilometer/hour (km/h) is the most common metric unit of speed or velocity. It simply means that something travelling at a constant speed of 1km/h will move a distance of exactly 1 kilometer in 1 hour. The correct symbol for this unit is km/h.

Unit Definition (speed of light [vacuum])
The speed of light in a vacuum is exactly equal to 299,792,458 metres per second (approximately 186,282.4 miles per second). The speed of light is denoted by the letter c, reputedly from the Latin celeritas, "speed", and also known as Einstein's constant. This exact speed is a definition, not a measurement, as the metre itself is defined in terms of the speed of light and the second.