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658 meters per second is about one-and-nine-tenths times as fast as The Speed of Sound.
In other words, it's 1.920 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.5210 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 343 meters per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 1,497 m/s to 1,560 m/s in water, depending on its salinity.
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