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Two boys, Matthew and Joseph are 10 year old twins. Matthew takes a trip into outer space in a new experimental rocket which moves at 0.8c relative to Earth. The rocket can only hold one person, so Joseph must stay on earth. According to Joseph, Matthew leaves for 20 years; but, when Matthew returns, Joseph is 30 years old. How old is Mo when he returns?

A) 12 years

B) 28 years

C) 30 years

D) 22 years

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