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I have a understanding of this but I don't know if it's correct, so I'll tell what I understand, if I'm wrong please correct me...

Suppose we have two observers A and B. If I say B is moving with respect to A then time is slower to B than to A. Also, if A measures B's dimension, he'll get a smaller measure than if B would do. Right?

So, we have that v = ds/dt, then if we know that B's dt is smaller than A's dt, B's ds should be smaller too so they agree with respect to the velocity. Is that right?

Sorry for my very bad english...