Question

Ed and Bob are twins. They plan a trip to planet X which is 60 light years from Earth. They both leave Earth at the same time on their 20th birthdays, but on different spacecraft. Ed’s space- craft travels at .90c, and Bob’s travels at .80c. As soon as Bob arrives he is met at the terminal by Ed (who arrived first). What are each of their biological ages (nearest 0.1 year) at this meeting?

Answer 1

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