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Yes, you can do a simple time, rate, distance calculation based on the speed of light. However, there are a lot of variables that come into play that make this calculation pretty inaccurate. First of all, the signal won’t actually travel at the speed of light. Fiber optic slows down the signal by about 30%, and there are additional bottlenecks such as switches, repeaters, etc. Here is an article that goes into greater detail.