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The speed of light is roughly 882 thousand times the speed of sound. -- Sound takes about 4.7 seconds to cover 1 mile. -- Light takes about 0.0000054 second to cover 1 mile. -- In the time it takes sound to travel one mile, light travels 881,741 miles. During a thunderstorm, you see the lightning before you hear the thunder, even though they're caused by the same event. Another clue to an easy answer: Nothing is faster than the speed of light.
The actual speed of sound varies depending on the altitude above sea level because sound travels at slightly different speeds at different temperatures and the temperature varies according to altitude. At sea level, the speed of sound is about 761 miles per hour (1,225 kilometers per hour). At 20,000 feet (6,096 meters), the speed of sound is 660 miles per hour (1,062 kilometers per hour). The speed of sound is commonly refered to as Mach 1, named after the 19th century Austrian physicist Ernst Mach [for biographical details click here].