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859.40 kilometers per hour is about seven-tenths as fast as The Speed of Sound.
In other words, it's 0.6960 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 1.440 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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