operations management
Question 3: Textbook Chapter 3, Problem 11, pp. 86 (Cooper’s Copy Shop)
Question 4:
Panchero’s restaurant has two items on their menu: Fajitas and Quesadillas. The serving process is as following: customers form two lines to order the food (ORDER), wait for the food to be packaged (PACKAGE), make payment (PAY), and fill their drinks and take fork and napkins (FILL). Since customers don’t have choice of meat and vegetable when they order Quesadillas, the PACKAGE stage for Quesadillas is shorter than for Fajitas.
The restaurant serves dinner from 6 to 9 pm. From 6 to 8 pm, 60 customers per hour order Fajitas and 40 customers per hour order Quesadillas. From 8 to 9 pm, 40 order Fajitas and 30 order Quesadillas. The processing rates are specified in the process flow diagram:
Quesadilla
Fajita
ORDER
120/hr
PACKAGE 48/hr
PACKAGE 60/hr
PAY
95/hr
FILL
150/hr
Fajita
….
….
Quesadilla
a) Identify the throughput rates of the process for Fajita and Quesadilla, respectively?
b) Draw an inventory buildup diagram. At what time would the last customer leave the system?
Question 5: Textbook Chapter 3, Problem 8, pp. 85 (New Time Video’s)
Question 6: Safety regulations require that the time between airplane takeoffs (on the same runway) will be at least 3 minutes. When taking off, the run time of an airplane on the runway is 45 seconds. Planes are on average waiting 4 minutes and 15 seconds for take-off. On average there are 15 planes taking off per hour. How many planes are either on the runway or waiting to take off?
Questions 7: Textbook Chapter 15, Problem # 4, pp 547
Questions 8: Consider the following information about a small project:
|
Task |
Budget |
Duration (days) |
Immediate Predecessors |
Shortest Time Possible |
Acceleration Cost per day |
|
A |
$200 |
2 |
None |
2 |
|
|
B |
$500 |
5 |
A |
3 |
$30 |
|
C |
$200 |
2 |
B |
1 |
$15 |
|
D |
$400 |
4 |
A |
4 |
|
|
E |
$300 |
3 |
B&D |
1 |
$20 |
|
F |
$400 |
4 |
E&C |
2 |
$40 |
a. Identify the critical path by forward and backward paths. For the tasks that are not on the critical path, identify their slacks.
b. At the end of 8th day, assume the following progress of the project:
a. Tasks A, B, D are 100% completed, and the actual costs spent for them are $200, $500 and $450, respectively.
b. Task C is 80% completed, and already cost $100
c. Task E is 66.67% completed, and already cost $100
d. Task F is not started yet, and didn’t cost anything either.
Evaluate the progress of the project by filling the following blanks (both in the table and in the sentence below the table):
|
Task |
Budget |
Scheduled Progress |
Performed Progress |
ACWP |
BCWS |
BCWP |
|
A |
$200 |
100% |
100% |
$200 |
|
|
|
B |
$500 |
100% |
100% |
$500 |
|
|
|
C |
$200 |
|
80% |
$100 |
|
|
|
D |
$400 |
|
100% |
$450 |
|
|
|
E |
$300 |
|
66.67% |
$100 |
|
|
|
F |
$400 |
|
0% |
|
|
|
|
Total |
|
|
|
|
|
|
The whole project is ____ (“ahead of” / “behind”) schedule, and ____ (“above” / “under”) budget.
c. Find the cost-effective way to reduce the completion time to 9 days.
Note: When you need to accelerate multiple tasks at the same time, please identify them in a single step, such as: “Step **: Accelerate task(s) _** and **___ by __**__ days.
Step 1: Accelerate task(s) _____ by _____ days
Step 2: Accelerate task(s) _____ by _____ days
Step 3: Accelerate task(s) _____ by _____ days
Step 4: Accelerate task(s) _____ by _____ days
Step 5: Accelerate task(s) _____ by _____ days