How fast and in what direction must galaxy a be moving if, Physics

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How fast and in what direction must galaxy a be moving if

How fast and in what direction must galaxy A be moving if an absorption line found at wavelength 550nm (green) for a stationary galaxy is shifted to 450nm (blue) (a "blue shift") for Galaxy A? How fast and in what direction is galaxy B moving if it shows the same line shifted to 700nm (red shift)?

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