Question: Two spaceships are observed from Earth to be approaching each other along a straight line. Ship A moves at 0.40c relative to the Earth observer,

Two spaceships are observed from Earth to be approaching each other along a straight line. Ship A moves at 0.40c relative to the Earth observer, and ship B moves at 0.50c relative to the same observer. What speed does the captain of ship A report for the speed of ship B?

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