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Mach is the ratio of an object's speed to the speed of sound. For example, something traveling at Mach 5 is traveling at 5 times the speed of sound.
The speed of sound varies depending on many factors. In dry air, at 0 degrees celsius, the speed of sound is about 331.3 m/s.
A mile per hour is a unit of speed commonly used in the United States.
It is equal to to exactly 1.609344 kilometers per hour.