So this is my first course in upper level physics, and i'm still trying to figure out special relativity. The problem: Two events occur at the same place in a certain inertial frame and are separated by a time interval of 4sec. What is the spatial separation between these two events in an inertial frame in which the events are separated by a time interval of 6 sec? I know the problem states that the two events occur in a certain inertial frame (frame S), and have a dt = 4. but I'm confused as to what It is exactly asking, is it asking what the d would be in another inertial frame where the dt = 6? I'm Just confused on setting up the problem and feel stupid.