What is the speed of light in water? in glycerine?

You can search this speed….
##n=C/V##
##N##=Refraction Indice
##C##= Speed of light
##V##=Speed in the diferente mean
Are you agree to me that ##n=c/v## is equals ## v=c/n?##
So…. if## C=300.000( km )/s##
and the Water Refraction:## 1333##
and the Glycerine Refraction:## 19##
We find that the speed in this mean are aprox:
WATER## 225.500( km)/s##
GLYCERINE: ##157800( km)/s##