Run 5 races, with 5 horses per race.
Thus, all 25 horses have competed exactly once.
Pick the winner from each of the 5 race,
and run one more race, namely a 6th race, with those 5 horses.
The winner is the fastest horse of all 25 horses.
In the US they run counter clockwise but in Europe they run clockwise.
It depends but they are usually about one mile, or half a mile and the horses circle it twice.
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