First, why present that mathematical bit? It is not even an equation, makes no assertion or statement. It is merely a ratio or fraction. One could say that Einstein said: E = mc squared, that is a statement. But how could one say 2/3.
Add the speeds of Einsteins lighting strikes and trains.
http://homepage.mac.com/ardeshir/Einstein'sTrain.html
Here is a more applicable example:
Thus, light emitted from a moving airplane does not travel with the speed of light plus the speed of the airplane, it travels with the "speed of light", no matter what the speed of the airplane! Although this seems strange, it has been confirmed in many experiments. These experiments show that it is our "common sense" that is wrong in this case!
http://csep10.phys.utk.edu/astr162/lect/cosmology/lightspeed.html
In other words the speed of the plane plus the speed of the light does not equal the speed of the plane plus the speed of the light. For a plane traveling at the speed of light this is written as an equation thus: speed of plane (186,000 miles per seconds) + speed of headlight (186,000 miles per second) = speed of headlight beams (186,000 miles per second).
Nothing can be faster than the speed of light. Any time you add anything to it the speed remains the same.