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Seen from Earth, there are two Milky Ways growing distant from the Earth at speeds vA...

Seen from Earth, there are two Milky Ways growing distant from the Earth at speeds vA = -0,7c and vB = 0,7c.
What is the speed of Earth with respect to each of the Milky Ways?
What is the speed of Milky Way B with respect to Milky Way A?
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