A base on Planet (X) fires a missile toward an oncoming space fighter. The missile's speed according

Question:

A base on Planet $X$ fires a missile toward an oncoming space fighter. The missile's speed according to the base is $0.85 c$. The space fighter measures the missile's speed as $0.96 c$. How fast is the space fighter traveling relative to Planet $\mathrm{X}$ ?

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