[neutralino]

Originally Posted by swoarg what speed does time travel at

First you need to define what you mean by speed in this context. The normal definition is that speed is the time rate of change of position, which is not what you mean in this case.

RascalPuff's answer is the most correct in this post thus far: special relativity shows us that time is an observer dependent quantity. For example, a body moving at some speed (less than the speed of light) will measure a different amount of time has passed between two events than a stationary observer (stationary with respect to whatever frame we are taking to be a rest frame). See here for a nice introduction to relativity.