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0.00000280 yards per minute is about 0.0000000001 times as fast as The Speed of Sound.
In other words, it's 0.0000000001240 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 8,060,000,000 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 22,500 yards per minute. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 98,200 yards per minute to 102,000 yards per minute in water, depending on its salinity.
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