Difficult Puzzle || 25 Horses Race || Asked in Google and Microsoft Interviews

This is one of the difficult puzzles asked in interviews of companies such as Google and Microsoft.
You have 25 horses and you want to pick the fastest 3 horses out of them. So you decide to conduct a race.
But you have only 5 tracks. So in one race, only 5 horses can run at the same time.
An important thing to note is, you don't have any stop watch/timer with you.

PUZZLE:
What is the minimum number of races required to conduct, in order to find the fastest 3 horses?

The video has complete explanation of the answer.

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