The international Space Federation constructs a new spaceship that can travel at

Question

The international Space Federation constructs a new spaceship that can travel at a speed of 0.9c. 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 2 years doing research before returning back to Earth.
How much time does the journey take?

I tried doing t= (2 x 5.98ly)/(0.9c) + 2 yrs = 15.28889, but I keep getting it wrong.

Explanation / Answer

using the formula T=2L/v

added 2 to that formula

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