The Bijou Theater shows vintage movies. Customers arrive at the theater line at the rate of 80 per hour. The ticket seller averages 40 seconds per customer, which includes placing validation stamps on customers’ parking lot receipts and punching their frequent watcher cards. (Because of these added services, many customers don’t get in until after the feature has started.)
What would be the customer time in the system if a second window was opened with each server doing all three tasks? (Use closest λ/µ value from Exhibit 7.12. Do not round intermediate calculations. Round your answer to 3 decimal places.)