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391 meters per hour is about one-twentieth as as Michael Phelps.
In other words, it's 0.055913 times the of Michael Phelps, and the of Michael Phelps is 17.885 times that amount.
(at the Beijing Olympics, 2008; 200 m freestyle) (a.k.a. Michael Fred Phelps) (swimmer; 1985-)
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