Mach 1 = Speed of sound = 340.29m/s Mach 7 = 2,382 m/s or 5,328 mph The speed of sound changes with temperature and elevation so check out this link if you want more info: http://www.aerospaceweb.org/question/atmosphere/q0102c.shtml
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Some call it hypersonic - others hold that for Mach 7
0,72 Mach is a subsonic speed. Mach number = speed of an object/speed of sound The speed of sound in dry air at 20 0C is 1 236 km/h.
That means the speed, compared to the speed of sound. For example, "mach 2" means twice the speed of sound.
Mach 1 is the speed of sound. 768 miles per hr. Mach 2 is twice that & so on.
Mach 0.8 = about 593.2 mph