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547.50 mach is about 550 times as fast as The Speed of Sound.
In other words, it's 529 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.00189 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 1.03 mach. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 4.520 mach to 4.710 mach in water, depending on its salinity.
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