Hello guys. I have a question for one of postulates of relativity. Consider there are three observers (called A, B, and C) in x-direction only. A is at rest. B is moving to the left relative to A with velocity 0.7c. C is to the right relative to A with velocity 0.7c. Then when A sees B or C, they can not move faster than c. It's correct right? However, when B and C see each other, is it possible that their (relative) velocities are faster than c (maybe 1.4c) or not?