Question: A distant quasar is found to be moving away from the earth at 0.80c. A galaxy closer to the earth and along the same line

A distant quasar is found to be moving away from the earth at 0.80c. A galaxy closer to the earth and along the same line of sight is moving away from us at 0.20c. What is the recessional speed of the quasar, as a fraction of c, as measured by astronomers in the other galaxy?

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