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Practice Questions: Process Analysis and Capacity Management
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
takeoff.
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
3.
In Children’s Hospital in Seattle there are on average 60 births per week.
Mother and child stay, on average, two days before they leave the hospital.
In
Swedish hospital (also in Seattle), the average number of births per week is
210.
Mothers and children stay in the hospital 2 days on average.
a.
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This note was uploaded on 03/31/2009 for the course BUAD 311 taught by Professor Vaitsos during the Fall '07 term at USC.
 Fall '07
 Vaitsos
 Management

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