Forgive me if this is an ignorant question. I have only a very superficial grasp of GR and SR, but this has been really bothering me ever for a while now. I understand that according to SR, nothing can excede the speed of light. I also understand that constant-velocity motion is relative to the observer, and that there is no absolute notion of motion. So, here's my question: Two observers are travelling through a vast, empty region of space from opposite directions, but on parallel, nearby paths. They are both travelling at a constant speed greater than half the speed of light--say .75 the speed of light. When they passed one another, wouldnt each observe that the other was travelling at a speed greater than light-- 1.5x SOL? How can this be? Again, I apoligise if it's a stupid question, but I got to know. Thanks in advance.