Convert from benz to mach

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 (mach)
The Mach is a measure of velocity relative to the speed of sound. The precise speed of sound varies with the density and temperature of the atmosphere, although at 0 °C (at 1atm.) the speed of sound is 331.6 m/s. The mach speed is important to the control of an aircraft, especially at speeds close to or exceeding Mach 1.0. The unit is named after the Austrian physicist Ernst Mach.