Service tax on renting of buses

Dear Sir,

I have one query in service tax regarding the taxability of service tax.

Query:- Mr. X have A.C buses, and Mr.Y have fill a Tendor in School (School Requires buses for students). Mr. Y have no buses, so Mr.Y take Buses on Rent From Mr.X and give these buses to school. Now Please give me the Taxability of Service Tax for Both Mr.X and Mr. Y ? (Wether they Cover in 25/2012 or Negative list , or not cover any where)