From http://www.freerepublic.com/focus/vetscor/1981814/posts?page=1 "The plane w... | Hacker News

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		bane on March 8, 2014 \| parent \| context \| favorite \| on: Behind the stick of the SR-71 From http://www.freerepublic.com/focus/vetscor/1981814/posts?page... "The plane was flying a mile every 1.6 seconds, well above our Mach 3.2 limit." So asked Wolfram about this https://www.wolframalpha.com/input/?i=1+mile+per+1.6+seconds... 2250 mph (3629 kph) Mach 2.956 at Sea level (340.3 m/s) I couldn't figure out the magic English sentence that would get it to calculate the Mach at different altitudes.

snogglethorpe on March 8, 2014 [–]

http://www.fighter-planes.com/jetmach1.htm

According to that page, at 60,000 feet the speed of sound is 1062 km/h, making 3629 km/h approximately mach 3.4.

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