A ufo is observed directly above the earth moving

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A UFO is observed directly above the earth moving at a constant velocity. An astronaut on the moon (3.8 10⁸ m from earth) observes the UFO passing overhead 5.1 s later. From the UFO's reference frame, how long did it take to travel from the earth to the moon?(answer in s please)

Reference no: EM131019187

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