How fast is mach 78?

Answer 1

Mach 78 refers to a speed that is 78 times the speed of sound. At sea level, the speed of sound is approximately 1,235 kilometers per hour (767 miles per hour), which means Mach 78 would be around 96,330 kilometers per hour (59,950 miles per hour). This speed is well beyond the capabilities of current aircraft and is more relevant in theoretical discussions about hypersonic travel.