The speed of sound varies depending on the air density and temperature you’re traveling in. For our calculation, one Mach is equal to 343 meters per second, The Blackbird was designed to cruise at Mach 3+, just over three times the speed of sound or more than 2,200 miles per hour and at altitudes up to 85,000 feet. And yes the Mig-25 would travel at speeds approaching Mach 3.2, but with two problems that happen when approaching this speed. 1. The engines literly melt. Now you know that Mach 3.2 is equal to 3951.36 km/h. Please enter another speed in Mach that we will convert to kmh for you. Mach in kmh.The fastest fighter jet is the Mikoyan-Gurevich MiG-25 Foxbat, capable of Mach 3.2 or 2,190mph. While not as fast as some retired or experimental aircraft,
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