what is the maximum speed in air
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Explanation:
at 20 degree the speed of the sound in air is about 343 meters / second ( 1235 / km per hour)
1125 feets per second ; (767 mhp; 667kn) or kilometres in 2.9 second or a mile in 4.7 seconds .........
it actually depends on the weathe
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343.....
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