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630.2 yards per second is about one-and-two-thirds times as as The Speed of Sound.
In other words, the of The Speed of Sound is 0.595 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 375 yards per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 1,640 yards per second to 1,710 yards per second in water, depending on its salinity.
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