Here's how we get that:

* Mach 1: Represents the speed of sound, which is approximately 1,235 kilometers per hour (767 miles per hour) at sea level.

* Mach 80: Simply multiply Mach 1 by 80: 1,235 km/h * 80 = 98,800 km/h (61,360 mph).

Important Note: This speed is hypothetical. No known aircraft or spacecraft can reach Mach 80. It is significantly faster than even the fastest military jets.