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When I calculated your question i got 2,464 MPH as the answer,I might be wrong but I don't think so.(if you want to know how I got that I multiplied 770 by 3.2.)
Mach 1 is 761.21 mph.Use this equation to convert Mach to miles per hour: mach x 761.21 = mph
Mach 2.
Ok, let's figure this one out: Assume mach speed is 1,010 feet per second, we could travel 689 miles in one hour. (1010 ft * 60sec *60min) / 5,280 ft = 689 mph rounded. Therefore, 0.81 of mach should be 558.09 mph
A Mach number is a dimensionless quantity representing the ratio of speed of an object moving through a fluid and the local speed of sound. A Mach number varies by the composition of the surrounding medium and also by local conditions, especially temperature and pressure. As such, it cannot be quantified to a particular speed.As a very rough estimate, use 760 mph.
The Mach number for speed is a function of how fast an object is going relative to the speed of sound in that medium (which can vary). The speed of sound at sea level is around 768 mph, so Mach 3.3 at around this level will be 768 x 3.3 = 2534 mph