Question: Spacecraft 1 is moving at speed 0.85c and is catching up with spacecraft 2, which is moving at speed 0.75c (both measured by an observer

Spacecraft 1 is moving at speed 0.85c and is catching up with spacecraft 2, which is moving at speed 0.75c (both measured by an observer on the Earth). What is the speed of spacecraft 2 as measured by the pilot of spacecraft 1?

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