Convert from benz to speed of light [glass]

Unit Definition (benz)
The benz is a proposed metric unit of speed, equal to 1 meter per second or about 2.237 miles per hour. The unit would honor Karl F. Benz (1844-1929), the German engineer generally regarded as the inventor of the automobile.

Unit Definition (speed of light [glass])
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.