Had to look up “hypersonic,” so consider this back of the envelope math from an interested amateur.

Hypersonic is the term used for speeds over Mach 5. Mach 1 is equal to the speed of sound, however the speed of sound varies at different elevation.

Sound travels slower in mediums that are less dense, so the higher you go in elevation the slower Mach is.

Mach 5 is about 6,125km/h (3,805.9mph) at sea level, and about 5,339 km/h (3,317.5mph) at 35,000ft, which makes is where you’ll see lots of commercial airliners.

Source: https://www.quora.com/How-fast-is-mach-5-speed?share=1