Assuming 300,000 km/sec for c; I am in a space ship which is 300 meters long travelling at 0.5c. A beam of light passes me and I want to measure how long it took to travel the length of my ship. As c is the same in all frames of reference, I would work this out as distance (300 m) divided by speed (300,000 km/sec) which = 1 microsecond. Is this correct? If so, what about length contraction?