I think I'm thinking to hard for this one, so I'll wait till tomorrow before checking up with you guys. I'll let my brain freshen up first. Yes, I have a "thing" for figuring it out on my own. Anyways, it's a question from David Hogg's book, so it is NOT my homework. Problem 2-8 Two spaceships, each measuring 100 m in its own rest frame, pass by each other travelling in opposite directions. Instruments on board spaceship A determine that the front of spaceship B requires 5x10^-6 s to traverse the full length of A. a) What is the relative velocity of the two spaceships? b)How much time elapses on a clock from spaceship B as it traverses the full length of A? Now, that I typed it out, I believe I got it now, so I'll check it out later, and see you guys in 12 hours. Thanks.