Frank and mary are twins and mary wants to travel to our


Frank and Mary are twins, and Mary wants to travel to our nearest star system, Alpha Centauri (4.30 lightyears away). Mary leaves on her 30th birthday and intends to return to Earth on her 52nd birthday.

(a) Assuming her spaceship returns from Alpha Centauri without stopping, how fast must her spaceship travel?

(b) How old will Frank be when she returns?

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