* Mach 1 is the speed of sound. The speed of sound varies slightly depending on temperature and altitude, but it's roughly 767 mph (1,235 km/h) at sea level.

* To find the speed in mph, multiply Mach 79 by the speed of sound.

So: 79 Mach * 767 mph/Mach = 60,543 mph

Therefore, 79 Mach is approximately 60,543 miles per hour. That's incredibly fast!