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955 mach is about 20,000 times as fast as Secretariat.
In other words, it's 18,800 times the speed of Secretariat, and the speed of Secretariat is 0.00005320 times that amount.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 0.0506 mach in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
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