Alan the astronomer is earth-bound and observes two quasars, Ask an Expert

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Alan the astronomer is earth-bound and observes two quasars moving away from each other along a line that passes through the earth. Alan observes that each is moving with a speed of 2.1 x 10⁸ m/s relative to the earth. Find at what speed are the quasars moving apart relative to each other?

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