in 1849, Fizeau set up an experiment to measure the speed of light. The discription of this experiment can be found on wikipedia. http://commons.wikimedia.org/wiki/File:Zahnradmethode_Fizeau.jpg
A animation can be found on http://fr.wikipedia.org/wiki/Appareil_de_Fizeau
L is the source of light
The cogwheel 'Z' has T number of teeth,rotating at X RPM
d is the distance(in km) separating lenses S1 and S2.
Given T, X and d, what was Fizeau's approximation of the speed of light in km/s?