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I know that nothing can exceed the speed of light c. So is it consistent with special relativity because it is not a physical object that is moving at 1.60c? I'm asking because I'm really not sure if I'm correct.Two identical spacecraft are moving in opposite directions each with a speed of 0.80c as measured by an observer on the ground. The observer on the ground measures the separation of the spacecraft as increasing at a rate of 1.60c.

Explain how this observation is consistent with the theory of special relativity.

Thanks for your help.