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# practice_1_solution - Practice#1 Solutions Process Analysis...

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Practice #1 Solutions Process Analysis and Capacity Management BUAD311 Operations Management Spring 2009 Hiroshi Ochiumi 1. The Avis Company is a car rental company and is located 3 miles from the Los Angeles airport (LAX). Avis is dispatching a bus from its offices to the airport every 2 min. The average traveling time (a round trip) is 20 min. a. How many Avis buses are traveling to and from the airport? The throughput rate is 30 buses per hour. The throughput time is 20/60 =1/3 hours TT = WIP/TR TT*TR = WIP 30*1/3 = 10 10 buses are traveling to and from the airport. b. The branch manager wants to improve the service and suggests dispatching buses every 0.5 min. She argues that this will reduce the average traveling time from the airport to Avis offices to 2.5 min. Is she correct? If your answer is negative then what will the average traveling time be? This reduces the average waiting time, but has no effect on the average traveling time. The average traveling time does not change and will remain 20 min. 2. Safety regulations require that the time between airplane takeoffs (on the same runway) will be at least 3 min. When taking off, the run time of an airplane on the runway is 45 sec. Planes are on average waiting 4 min and 15 sec for take-off. On average there are 15 plans taking off per hour. a. How many planes are either on the runway or waiting to take off? TR = 15 plans per hour. TT = (0.75 +4.25)/60 = 1/12 of an hour WIP = TT*TR = 15*1/12 = 1.25

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3. In Children ’s Hospital in Seattle there are on average 60 births per week.
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