A set of twins, Bobby and Betty, are born on Earth. Bobby sets off to a distant

Question

A set of twins, Bobby and Betty, are born on Earth. Bobby sets off to a distant planet at high speed, arrives, and heads back to earth. Betty remains on Earth. In Bobby's frame, he is at rest and Betty is moving, so according to Einstein, he has aged 20 years while Betty has aged only 2. In Betty's frame she is at rest, so she has aged 20 years and Bobby has aged only 2. Who will be older when Bobby and Betty meet again?

A)Betty
B)They both seem to be younger than the other person.
C)The both seem to be older than the other person.
D)They are the same age.
E)Bobby.

Explanation / Answer

C)The both seem to be older than the other person.

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