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139 inches per second is about one-third as fast as Usain Bolt
In other words, it's 0.343 times the speed of Usain Bolt, and the speed of Usain Bolt is 2.92 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 407 inches 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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