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851 meters per hour is about one-tenth as fast as Michael Phelps.
In other words, it's 0.121690 times the speed of Michael Phelps, and the speed of Michael Phelps is 8.21760 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 6,993 meters 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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