Analyzing a fleet of delivery trucks
A distribution center delivers material to the retail stores in its service region. Twelve trucks are used for delivery. The time required to load a truck is exponentially distributed with a mean of 40 minutes; the time required to deliver a load and return is exponentially distributed with a mean of 6 hours. There are two crews available for loading trucks. The distribution center operates continuously, that is, 24 hours per day and 7 days per week.