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859.4 kilometers per hour is about seven-tenths as as The Speed of Sound.
In other words, it's 0.696 times the of The Speed of Sound, and the of The Speed of Sound is 1.44 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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