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How fast is the speed of sound?

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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 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or one km in 2.91 s or one mile in 4.69 s

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The speed of sound is approximately 343 meters per second (1235 kilometers per hour or 767 miles per hour) in dry air at 20 degrees Celsius (68 degrees Fahrenheit).
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