Tankers arrive at an oil port with the distribution of interarrival times shown in Table 12. The port has two terminals, A and B. Terminal B is newer and therefore more efficient than terminal A. The time it takes to unload a tanker depends on the tanker’s size. 

A supertanker takes 4 days to unload at terminal A and 3 days at terminal B. A midsize tanker takes 3 days at terminal A and 2 days at terminal B. The small tankers take 2 days at terminal A and 1 day at terminal B. Arriving tankers form a single waiting line in the port area until a terminal becomes available for service. Service is given on an FCFS basis. The type of tankers and the frequency with which they visit this port is given by the distribution in Table 13. 

Develop a simulation model for this port. Compute such statistics as the average number of tankers in port, the average number of days in port for a tanker, and the percentage of idle time for each of the terminals. (Hint: Use the flowchart in Figure 4 and modify it for a multiserver queuing system.)

TABLE 12

Interarrival Times (days)	Probability
1	.20
2	.25
3	.35
4	.15
5	.05

TABLE 13

Type of Tanker	Probability
Supertanker	.40
Midsize tanker	.35
Small tanker	.25