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745 knots is about one-and-one-tenth times as fast as The Speed of Sound.
In other words, it's 1.120 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.8930 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 667 knots. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 2,910 knots to 3,030 knots in water, depending on its salinity.
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