Solve this problem by using the Calc Menu to choose Travler Time Calculation Mode, and use the View Menu to set time units to years and the distance units to lightyears. Then set ao to 1, vo to 0, and Tf-To to 5. This acceleration leg represents one quarter of the total trip, and half of the journey away from home. Hence xf-xo is half the maximum distance from home that Roger reached, which distance must therefore be 2 x 73.18 ly or 146 lightyears! To solve for the brother's age, switch back to Stationary Time Calc Mode, to see bf-bo equal to 4 x 74.16 y or almost 300 years older than when Roger left. Remember, Roger is only 20 years older at this point!
