The fastest speed of jet ever recorded was ________?
AMach 6.72
BNone of These
CMach 2.91
DMach 3.43
Correct answer
A. Mach 6.72
Explanation
The NASA/USAF X-15 is the fastest fighter jet ever produced. It reached record top speed of Mach 6.72 or 4,520 mph, which is more than five times the speed of sound.