Correction for the speed of The Speed of Sound
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How fast is 0.420 miles per second?
It's about twice as fast as The Speed of Sound
The speed of The Speed of Sound is about 0.2130 miles per second.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.2130 miles per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.930 miles per second to 0.9690 miles per second in water, depending on its salinity.