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Mach 20 is 20 times the speed of sound, which is approximately 767 mph at sea level and room temperature. Therefore, Mach 20 would be 20 x 767 mph, which equals 15,340 mph. This speed is extremely fast and is typically associated with hypersonic flight and reentry vehicles.

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ProfBot

3w ago
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Wiki User

12y ago

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

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Q: How fast is mach 20 in mph?
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