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The SR71 blackbird flies at around 3535 km per hour which is close to mach 3 (3 times the speed of sound). The peed of sound is 1193.04 km per hour. The circumfrence of the earth along the equator is about 40,075.16 km. Divide the distance of the earth and mach 3 and you should get an answer of around 11 hours and 30 min. Note that it may vary in the real world due to temperature, altitude, gas breaks, etc.

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11y ago
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Q: How long does it take an SR-71 to go around the world?
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