How fast is mach four?
The speed of Mach 4 (where Mach 1 is speed of sound) equals to 4939 km per hour (3069 mi per hour).
The speed of sound is 741 miles per hour. Mach 4 is 2964 miles per hour.
Mach four is four times the speed of sound. It is equivalent to 3069 miles per hour or 4939 kilometers per hour.
Join Alexa Answers
Help make Alexa smarter and share your knowledge with the worldLEARN MORE