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40 kilometers per minute is about one-and-nine-tenths times as fast as The Speed of Sound
In other words, it's 1.94 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.515 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 20.60 kilometers per minute. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 89.80 kilometers per minute to 93.60 kilometers per minute in water, depending on its salinity.
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