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Combined speeds at relativistic velocities


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If two space craft were approaching each other at 99.999% of the speed of light, what would the speed of each appear to be to the other since the speeds would not add up like two trains traveling at 100 mph toward each other. 

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1 hour ago, Moontanman said:

If two space craft were approaching each other at 99.999% of the speed of light, what would the speed of each appear to be to the other since the speeds would not add up like two trains traveling at 100 mph toward each other. 

Can't help too much as I am mathematically ignorant, but length contraction and time dilation are what is relevant. 

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