Galaxy A is reported to be receding from...

Galaxy A is reported to be receding from us with a speed of 0.45c. Galaxy B, located in precisely the opposite direction, is also found to be receding from us at this same speed. What multiple of c gives the recessional speed an observer on Galaxy A would find for (a) our galaxy and (b) Galaxy B?

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The correct Answer is:

(a) 0.45; (b) 0.75

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