A shipping company operates 10 container ships that can each carry 5000 containers oneach journey between ports. They want to be able to load and unload 20,000 containerseach week. Assume their ships always travel fully loaded. What is the longest averagetravel time between ports that allows them to meet their goal of 20,000 containers perweek?

44. US Airlines receives an average of 500 calls per hourfrom customers who want to make reservations, wherethe times between calls follow an exponential distribution. It takes an average of three minutes to handleeach call. Each customer who buys a ticket contributes$100 to US Airlines profit. It costs $15 per hour tostaff a telephone line. Any customer who receives abusy signal will purchase a ticket from another airline. How many telephone lines should US Airlineshave? Base your answer on an appropriate simulation.Does it matter whether the service times are exponentially distributed or gamma distributed? Experimentto find out.

A veterinary office with three processes (examination, greeting, and checkout) has two types of customers (boarding and medical). A veterinary office has a demand of 2 boarding customers per hour and 5 medical customers per hour. Boarding customers visit the greeting and checkout processes while medical customers visit all three processes. What is the total demand at the checkout process each hour? customers per hour

A retail catalog operation employs a bank of six telephone operators who process orders using computer terminals. When a terminal breaks down, it must be disconnected and taken to a nearby electronic repair shop, where it is repaired. The mean time between terminal breakdowns is six working days, and the mean time required to repair a terminal is two working days (both exponentially distributed). As a result of lost sales, it costs the mail-order operation an estimated $50 per day in lost profits each day a terminal is out for repair. The company pays the electronics repair shop $3000 per year on a service agreement to repair the terminals. The company is considering the possibility of signing a new service agreement with another electronics repair shop that will provide subsitutute terminals while the broken ones are at the repair shop. However, the new service agreement would cost the mail-order operation $15,000 per year. Assuming that there are 250 working days in a year, determine…