Consider two cars going in opposite direction one at speed $c/2$ and other just greater than $c/2$, then one bus will appear to other moving at speed more than $c$. How can an object travel at speed more than light?
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It can't. You need to use relativistic velocity addition formulas or Lorentz transformations. You are thinking classically (Galilean) but asking a relativistic problem. Check this out http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/einvel.html – jerk_dadt Mar 05 '14 at 07:46
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The duplicate I've suggested is itself a duplicate, but it's the closest match I found to your question. – John Rennie Mar 05 '14 at 07:47