Two tailors, Evelyn and Michelle, sit down to do some embroidery. Evelyn can embroider 3 shirts per hour, and Michelle can get through 6 shirts per hour. In addition, the tailors had previously finished some shirts. Evelyn has already completed 18 shirts, and Michelle has completed 9 shirts. Evelyn and Michelle decide to take a break when they have finished the same total number of shirts. How long will that take? How many shirts, in total, will each tailor have finished?