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Old June 15, 2012, 05:47 AM   #16
Senior Member
Join Date: September 12, 2008
Location: Chicago
Posts: 824
Luckily, I've never been shot at before (besides a self-induced graze... stupidity and alcohol, never again) but I looked this up and thought it was interesting.

The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air at 20 °C (68 °F), the speed of sound is 343.2 metres per second (1,126 ft/s). This is 1,236 kilometres per hour (768 mph), or about one kilometer in three seconds or approximately one mile in five seconds.
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