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The mach number is the speed, compared to the speed of sound in air. Thus, mach 1 is the speed of sound, mach 2 is twice (2 times) the speed of sound, mach 3 is 3 times the speed of sound, etc.

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Q: How fast is Mach 1 Mach 2 Mach 3 Mach 4 etc to the fastest Mach level on record?
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