At Mach 1, the speed of an aircraft is equal to the speed of sound — 720 mph or 332 miles per second. At Mach 2, an aircraft is traveling at twice the speed of sound; Mach 3 is three times the speed of sound, and so on.
In May of this year, the Air Force broke the Mach 5 record to reach Mach 6 for 200 seconds.
http://www.csmonitor.com/Innovation/Horizons/2010/0527/Scramjet-powered-X-51A-Waverider-missile-breaks-Mach-5-record
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