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2 kilometers per hour is about one-twentieth as fast as Usain Bolt
In other words, it's 0.0539 times the speed of Usain Bolt, and the speed of Usain Bolt is 18.60 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 37.2 kph 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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