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390,000 inches per hour is about one-fourth as fast as Usain Bolt
In other words, it's 0.2670 times the speed of Usain Bolt, and the speed of Usain Bolt is 3.750 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 1,460,000 inches per hour 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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