Refractive index of glass with respect to medium is 4/3. If the difference between velocities of light in medium and glass us 6.25?10^7m/s, then velocity of light in medium is?

Im solving it indirectly We know refractive index of glass is 3/2 So 3/2=velocity in vaccum/velocity in glass So velocity in glass is 2x10^8 m/s Further 4/3=velocity in medium/velocity in glass So by putting the value of the previous We get the answer 2.66x10^8