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615 yards per minute is about nine-tenths as fast as Usain Bolt
In other words, it's 0.91 times the speed of Usain Bolt, and the speed of Usain Bolt is 1.1 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 678 yards per minute 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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