Consider this: The Concorde cruised at 1,350 miles [2,150 km] an hour ​ — twice the speed of sound — ​ at an altitude of 60,000 feet [18,000 m] (more than 11 miles [18 km]).
Concorde lidoja ar ātrumu 2150 kilometri stundā (divreiz ātrāk par skaņu) 18 kilometru augstumā.