This question already has an answer here:
Well you know how it's said that things can't travel at or past the speed of light? However, can't they move at speeds greater than the speed of light relative to another object?
For example: What if two rocket ships that are travelling at 60% the speed of light fly past each other? Won't people on both ships perceive the other ship as travelling at a speed greater than the speed of light? If yes, does this have any significance?