Convert Mach 20 to Mach 4

Convert Mach 20 (extremely hypersonic) to Mach 4 (supersonic), a conversion for comparing advanced hypersonic and supersonic speeds.

Formula: Move from Mach 20 to Mach 4, representing deceleration from twenty times the speed of sound to four times the speed of sound.
Mach 20
A speed twenty times the speed of sound, equivalent to around 6,860 meters per second.
Mach 4
A speed four times the speed of sound, approximately 1,372 meters per second at sea level.

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