On a race track a maximum of 5 horses can race together at a time. There are a total of 25 horses. There is no way of timing the races. What is the minimum number R of races we need to conduct to get the top 3 fastest horses?
Select the correct option.
A) 5	B) 7	C) 8	D) 10	E) 11

Rationale: "r = 7 is the correct answer . good solution buneul . b"
Answer: B