Oh, dude, Mach 0.85 at 40,000 feet altitude is around 567 miles per hour. But like, who's counting, right? Just cruising along at that speed, no big deal.
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561.085mph
(mach 1 at 40,000 feet is 660.1mph)
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Mach 1 is 761.21 mph.Use this equation to convert Mach to miles per hour: mach x 761.21 = mph
How fast is 0.85 mach?
Mach 2.34 is equal to 2445 KM/HR or 1548 MPH.
mach 1 = 761.207 mph, so 761.207 * 0.791 = 602.115 mph
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