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0.0084 mach is about one-and-two-fifths times as fast as Michael Phelps.
In other words, it's 1.43370 times the speed of Michael Phelps, and the speed of Michael Phelps is 0.69750 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 0.0058588 mach. 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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