Relative electric permittivity of a medium is q and relative permeability is close to unity. What is the speed of em waves in the medium ?

Speed of  EM  wave  in  vacuum  is  C = 1μoεo   ................(1)
and  speed  of EM  wave  in a  medium    V = 1μmεm    ...........(2) 
Dividing  eq  (2)  by  (1) 
                                      VC = (μmμo)  (εmεo) εr  = εmεo =q  and    μr =μmμo =1  (given)             VC   = q       V =q  C

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