At sea level, Mach 80 would be approximately 97,488 kilometers per hour (60,596 miles per hour). This speed is significantly faster than the speed of sound, which is about 1,235 kilometers per hour (767 miles per hour) in dry air at 20°C (68°F).
Mach 0.8-1.0
The speed of Mach 1 varies, based on temperature and air pressure. At sea level, on an average day, that is about 761 mph (speed of sound) Mach 89 would be an incredibly high speed- 89 times the speed of sound- about 67,729 miles per hour. I know of nothing that travels at that speed (light, of course, is faster) . Explosives don't travel that fast when detonating.
Mach 1.7 is equal to about 1294 mph.
Mach 6 is about 4,449.3 mph
645.38104_MPH_">645.38104 MPH-is 0.87 Mach -
the SR 71 goes really fast it goes Mach 7 NOT Mach 3.
Mach 889 is about 659,233 mph
Mach 3.3 is about 2,512 mph depending on altitude.
mach 2.03
1,750.8 mph
Mach 6 is about 4,567 mph
Mach 0.7 is 533 mi/h (rounded)