Find number abcIf b9552 + b597c = 9553a find number abc. Multiple solutions may exist.
Correct answers: 36
The first user who solved this task is Djordje Timotijevic.
ConcordeIn 1970, the prototype British-built airplane Concorde 002 made its first supersonic flight (700 mph; 1,127 kph). A few months earlier, the French prototype, Concorde 001, had broken the sound barrier on 1 Oct 1969. Mach 2 was achieved by Concorde 001 on 4 Nov 1970, and by Concorde 002, a few days later on 12 Nov 1970. The combined number of supersonic flights by the two aircraft reached 100 by Jan 1971.