There are 25 horses among which you need to find fastest 3. You don't have a timer and a race can be among maximum 5 horses. Find minimum number of races required.

Question

Accepted Answer

Minimum 7 races are required to find the fastest 3 horses.

Divide the 25 horses into 5 groups of 5 horses each.
Conduct a race among each group, identifying the fastest horse in each race.
Take the top 3 horses from each race and conduct a final race among them.
The top 3 horses in the final race will be the fastest 3 horses overall.