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Mach 1 is the speed of sound about 760mph.

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Mach 1 is the speed of sound about 760mph.

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Frantisek Mach is 6' 1 1/2".

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Mach is the coefficient of the speed of sound, so Mach 1 means you are travelling at 1 x the speed of sound.

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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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Mach 1 is about 762 mph, so mach 20 is about 15,240mph.

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