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0.00081 miles per second is about one-tenth as fast as Usain Bolt
In other words, it's 0.1270 times the speed of Usain Bolt, and the speed of Usain Bolt is 7.870 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 0.00642 miles per second at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.
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