What is the recessional speed of the quasar

Reference no: EM13503131

A distant quasar is found to be moving away from the earth at 0.90 c. A galaxy closer to the earth and along the same line of sight is moving away from us at 0.40 c.

What is the recessional speed of the quasar as measured by astronomers in the other galaxy?

Reference no: EM13503131

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