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Finding velocities of galaxies

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1) Galaxy A is found to be receding from us with a speed of 0.8c. Galaxy B I found to be receding from us with a speed of 0.4c. (a) What is our velocity as seen from galaxy A? (b) What is velocity of galaxy B as seen from galaxy A, if both are seen in the same direction in space? (c) What is the velocity of galaxy B as seen from galaxy A, if they are seen in exactly opposite directions in space? ... {see attachment for complete list}

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