Translate The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. At 20 C 68 F the speed of sound in air is about 343 metres per second 1235 kmh 1125 fts 767 mph 667 kn or a kilometre in 2.9 s or a mile in 4.7 s.It depends strongly on temperature as well as the medium through which a sound
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