If their are 25-sylow 3-subgroups, then let K be one of them.

I know need to find out what the conjugates of K are and then use this fact with the normalizer of K to prove that he normalizer is a subgroup of order 15. If i can prove that he conjugates of K are exactly the set of Sylow 3 subgroups I would be done, can someone explain this to me?