How to add rational polynomials?

Clear[s]; 
f1 = 2/(s + 3); 
f2 = 7/(s^2 + 2.5*s + 7); 
Simplify[Together[f1 + f2]] 
 
Out[193]= (35. + 12.*s + 2.*s^2)/(21. + 14.5*s + 5.5*s^2 + s^3)