A pulse is sent down a transmission line that is not functioning properly. It has a propagation velocity of 2.

A pulse is sent down a transmission line that is not functioning properly. It has a propagation velocity of 2.1 x 10^8 m/s, and an inverted reflected pulse (equal in magnitude to the incident pulse) is returned in 0.731 ms. What is wrong with the line, and how far from the generator does the fault exist?