Equivalent Fractions · Superchallenge problem

Three pizzas are the same size. The first is cut into 6 equal slices, the second into 8 equal slices, and the third into 12 equal slices. Ava eats some slices of the first pizza, Ben some slices of the second, and Cy some slices of the third. They each eat the same amount of pizza, and together they eat 13 slices. What fraction of a pizza did each of them eat?