First, compute the amount by which each ages during his trip. Since they each see a length-contracted distance to the planet, light years (where ), the time of travel is where is in light years. Therefore, years and years. Next, we have to calculate how much Bill ages waiting for Ben to arrive. An observer on the planet will clock Bill’s travel time at years; in this time, Ben will have traveled light years, so he has 3.56 light years to go. It takes him years (on the planet clock) which is the amount by which Bill will age while waiting for Ben. Hence, Bill’s age will be 22+7.11+3.87=32.98 years and Ben’s will be 22+13.86=35.86 years.