You own Everything's Coming Up Roses flower shop. Your employee makes 4 deliveries per hour. The distance between the shop and the first delivery is 12 1/3 miles. The distance between the next three deliveries is 8 3/4 miles; 17 2/8 miles; and 23 2/3 miles respectively. The distance from the final delivery to the shop is 10 5/10 miles. What is the average distance for all segments of this trip?