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That all depends on the altitude the mach speed is occurring at. Mach 1 is defined as the speed of sound which is a function of fluid density.
In air at sea level and normal temperature, 0.85 mach = ~647 mph
0.85mach ~.(0.85*330)mph
Wiki User
∙ 12y ago
Wiki User
∙ 14y agoIt depends on the altitude, as velocity is dependent on on the speed of sound which varies at different altitudes. e.g. V = M*a, where 'a' is the speed of sound.
Wiki User
∙ 14y agoMach 0.82 = 1,004.5 km/h
Wiki User
∙ 11y agoMach 0.86 is 654.64 mph
Wiki User
∙ 10y agoMach 0.85 is about 647 mph
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The way you calculate mach into mph, is you type it into the calculator and it will tell you the answer! Now go do it....
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