Own age and age of the earth-based twin brother

Reference no: EM13653052

One 20-year-old twin brother takes a space trip with a speed of0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what is hisown age and the age of the Earth-based twin brother?
A) 20; 30
B) 30; 50
C) 50; 70
D) 70; 90

Reference no: EM13653052

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