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.It depends strongly on temperature as well as the medium through which a sound wave is propagating.. 1 Speed of sound = 1234.8 Kilometres per hour: 10 Speed of sound = 12348 Kilometres per hour: 2500 Speed of sound = 3087000 Kilometres per hour: 2 Speed of sound = 2469.6 Kilometres per hour: 20 Speed of sound = 24696 Kilometres per hour: 5000 Speed of sound = 6174000 Kilometres per hour: 3 Speed of sound = 3704.4 Kilometres per hour: 30 Speed of sound = 37044 Kilometres per hour

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1. The velocity of sound in air is 332 m/s. If the unitof length is km

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Joe Sexton. To convert a measurement in kilometers per hour to a measurement in speed of sound, multiply the speed by the following conversion ratio: 0.00081 speed of sound/kilometer per hour. Since one kilometer per hour is equal to 0.00081 speed of sound, you can use this simple formula to convert: speed of sound = kilometers per hour × 0.00081.. The speed of sound. The velocity of the sound is the distance during a time unit of a sound wave propagating through an elastic medium. In dry air at 20 ° C (68 ° F), the sound speed is 343.2 meters per second (1126 ft / s). This is 1 236 kilometers per hour (768 mph), or about one kilometer in three seconds or about one mile in five seconds.