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An allied spaceship, moving at 0.5 c with respect to Earth, shoots a photon missile at...

An allied spaceship, moving at 0.5 c with respect to Earth, shoots a photon missile at the speed of light at a revel spaceship, initially at 6000 km away, which is moving away from the allied ship at a constant velocity. According to the allied ship, the missile hits the revels 0.1 s after firing. How fast were the revels traveling with respect to earth?

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