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911 kilometers per hour is about three-fourths as fast as The Speed of Sound.
In other words, it's 0.7380 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 1.360 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 343 m/s. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 5,390 kilometers per hour to 5,620 kilometers per hour in water, depending on its salinity.
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