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**[SOLVED] Twin Paradox problem**

Here is a problem about twin paradox that I can't quite figure out. I got part a, but I can't get part b. I think that the 6 years spent doing research is kinda throwing me off. Help!!

The International Space Federation constructs a new spaceship that can travel at a speed of

**0.910c**. Mary, the astronaut, boards the spaceship to travel to Barnard's star, which is the second nearest star to our solar system after Alpha Centauri and is

**5.98 ly**away. After reaching Barnard's star, the spaceship travels slowly around the star system for

**6 years**doing research before returning back to Earth.

(a) How much time does the journey take?

**11.44913698 years**

(b) How much older is her twin Frank when she returns?

? years