In common everyday speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance. Sound travels faster in liquids and non-porous solids than it does in air. It travels about 4.3 times faster in water (1,484 m/s), and nearly 15 times as fast in iron (5,120 m/s), than in air at 20 degrees Celsius.
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18,000,000km per minute
Approx 1.15 km per minute.
At sea level, the human voice will move at the speed of approx 1225 km per hour. In 1 minute, it should have moved 20.4 km. However, it will attenuate and be lost well before it reaches that distance.
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