How old is andrea upon her return

Reference no: EM13699723

Problem: A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth, Andrea rides on a space ship which travels away from Earth at a speed of 0.6c for five years (as measured by Courtney), then turns around and comes back at 0.6c. When Andrea returns, Courtney is 20 years old.

Part A: How old is Andrea upon her return?

I need help to find how old Andrea is upon her return.

Reference no: EM13699723

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