Students and Hats

Nine students were sitting in a classroom. Their professor wanted them to test. The professor told all of his 9 students that he has 9 hats, The hats are either red or black. He also added that he has at least one hat with red color and the no. of black hats is greater than the no. of red hats. The professor keeps those hats on students' heads and ask them to tell me how many red and black hats are there? Obviously students can not talk to each other or no written communication, or looking into each other eyes; no such stupid options and no tricks.

Professor goes out and comes back after 20 minutes but nobody was able to answer the question. So he gave them 10 more minutes but the result was the same. So he decides to give them final 5 minutes. When he comes everybody was able to answer him correctly.

So what is the answer? and why?

4 Red & 5 Black

3 Red & 6 Black

2 Red & 7 Black

1 Red & 8 Black

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