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123 inches per hour is about one-two-thousandth as fast as Michael Phelps.
In other words, it's 0.00044676 times the speed of Michael Phelps, and the speed of Michael Phelps is 2,238.30 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
Setting a world record, Michael Phelps swam the 200 m freestyle in 1:42.96 for an average speed of 275,310 inches per hour. Phelps would go on to win nine gold medals individually in the 2008 Olympics - more than all but eight of the competing nations.
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