Galaxy a is moving away from us with a speed of 075c, Physics

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Galaxy a is moving away from us with a speed of 075c

Galaxy A is moving away from us with a speed of 0.75c relative to the earth. Galaxy B is moving away from us in the opposite direction with a relative speed of 0.55c. Assume that the earth and the galaxies are moving at constant velocities, so they are inertial reference frames. How fast is galaxy A moving according to an observer in galaxy B?

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Physics: Galaxy a is moving away from us with a speed of 075c

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