It depends on several factors, such as the specifications of the cartridge fired, and what type of gun is used to fire it (or more specifically, the barrel length). It can be as little as about 300 FPS or as high as several thousand FPS.
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7.04 seconds (5280 feet in a mile x 2 miles = 10560 feet) / 1500 feet per second = 7.04 seconds
About 41 feet per second.
85.0666667 feet per second
73.33 feet per second.
The dry air speed of sound is about 1125 FPS, so anything over that is considered supersonic.