2.04*10^8 m/s
Explanation: The absolute index of refraction of corn oil is 1.47.
n=c/v
v=c/n; c=3.00*10^8m/s and n=1.47
So you take c divide by n, (3.00*10^8m/s)/1.47 thne you will get about 2.04*10^8m/s