A muon is observed to travel 800 meters before disintigrating. The lifetime of a muon is 2 * 10 ^ -6. So the observer concludes that the muon traveled at a speed of 4 * 10^8 m/s which is faster than c. Why is the observer wrong? I though it was impossible for anything to travel faster than light in any inertial reference. I don't see how you can get around the fact that the muon moved so far in that amount of time and at least its average velocity was faster than c. I do not see where you can apply the Lorentz factor.