PrepBytes Interview Puzzle Series: Horse race

There are 25 horses among which you need to find out the fastest 3 horses. You can conduct race among at most 5 to find out their relative speed. At no point, you can find out the actual speed of the horse in a race. Find out how many races are required to get the top 3 horses.
A puzzle is a problem or enigma that tests the ingenuity of the solver. In a basic puzzle, one is intended to put together pieces in a logical way in order to come up with the desired solution.

More you solve puzzles better you become at this mind game.

Solve this interesting puzzle and do not forget to reply in the comment box.

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[rishardmand]

If anyone wonders why it can't be six, if you start with five races with five horses each you get the fastest from each group. Race them and you can rank the fastest from each group. But, the second fastest from group 1 might be faster than the fastest from group 2, second fastest from group 2 might be faster than the fastest from group 3 and so on - another race is needed.