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4. Father is 55 years old and daughter have 17 years. One of them go to a high-speed round-trip journey in the galaxy while

4. Father is 55 years old and daughter have 17 years. One of them go to a high-speed round-trip journey in the galaxy while the other stays home on Earth a) Is it possible that they are of same age when they meet again? b) Who need to go to round-trip, is this traveling in past or future? c) If they meet, (and have same age), when daughter is 60 years old, what need to be speed of space ship?

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