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851 meters per hour is about one-tenth as as Michael Phelps.
In other words, it's 0.12169 times the of Michael Phelps, and the of Michael Phelps is 8.2176 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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