In a bank there are 2 checkouts, each with its own row of infinite size: checkout 1 for “fast” customers, with a time of 2 minutes, and checkout 2 for “slow” customers, with a time of 16.4 minutes, in both cases with exponential distribution. “Slow” and “fast” customers arrive according to an exponential function, with mean 8 and 20 minutes/customer, respectively. Some days, in particular, only 1 cashier comes to work who has to serve both lines according to the following cyclical sequence; 5 “fast” clients and 2 “slow” clients. The time to move between the boxes is 0.33 minutes. Simulate the process in ProModel for 80 hours and determine:   The average number of customers waiting in each queue.   The optimal service sequence to minimize waiting time, considering both types of customers.

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18. In a bank there are 2 checkouts, each with its own row of infinite size: checkout 1 for “fast” customers, with a time of 2 minutes, and checkout 2 for “slow” customers, with a time of 16.4 minutes, in both cases with exponential distribution. “Slow” and “fast” customers arrive according to an exponential function, with mean 8 and 20 minutes/customer, respectively. Some days, in particular, only 1 cashier comes to work who has to serve both lines according to the following cyclical sequence; 5 “fast” clients and 2 “slow” clients. The time to move between the boxes is 0.33 minutes. Simulate the process in ProModel for 80 hours and determine:
 
The average number of customers waiting in each queue.
 
The optimal service sequence to minimize waiting time, considering both types of customers. 
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