After delivering her report, Tamera was chosen to travel to a nearby star while her sister remained on Earth. Relative to Tia, Tamera's trip to the star and back lasted 15 years as she moved at a speed of 3/5c (three-fifths the speed of light). As Tamera begins her journey to the nearby star, she notices that she doesn't feel like she is in motion, and thus assumes it is her sister, Tia, and the Earth that are moving away from her. What is the total distance, measured in lightyears, Tamera believes she will go to reach the star and return