MAT540 Homework
Week 10
Page 1 of 2
MAT540
Week 10 Homework
Chapter 6
1. Consider the following transportation problem: From To (Cost) Supply 1 2 3
A
6
5
5
150
B
11
8
9
85
C
4
10
7
125
Demand
70
100
80
Formulate this problem as a linear programming model and solve it by the using the computer.
2. Consider the following transportation problem: From To (Cost) Supply 1 2 3
A
8
14
8
120
B
6
17
7
80
C
9
24
10
150
Demand
110
140
100
Solve it by using the computer.
3. World foods, Inc. imports food products such as meats, cheeses, and pastries to the United States from warehouses at ports in Hamburg, Marseilles and Liverpool. Ships from these ports deliver the products to Norfolk, New York and Savannah, where they are stored in company warehouses before being shipped to distribution centers in Dallas, St. Louis and Chicago. The products are then distributed to specialty foods stores and sold through catalogs. The shipping costs ($/1,000 lb.) from the European ports to the U.S. cities and the available supplies (1000 lb.) at the European ports are provided in the following table:
MAT540 Homework
Week 10
Page 2 of 2
From To (Cost) Supply 4. Norfolk 5. New York 6. Savannah
1. Hamburg
320
280
555
75
2. Marseilles
410
470
365
85
3. Liverpool
550
355
525
40
The transportation costs ($/1000 lb.) from each U.S. city of the three distribution centers and the demands (1000 lb.) at the distribution centers are as follows: Warehouse Distribution Center 7. Dallas 8. St. Louis 9. Chicago
4. Norfolk
80
78
85
5. New York
100
120
95
6. Savannah
65
75
90
Demand
85
70
65
Determine the optimal shipments between the European ports and the warehouses and the distribution centers to minimize total transportation costs.
4. The Omega Pharmaceutical firm has five salespersons, whom the firm wants to assign to five sales regions. Given their various previous contacts, the sales persons are able to cover the regions in different amounts of time. The amount of time (days) required by each salesperson to cover each city is shown in the following table: Salesperson Region (days) A B C D E
1
20
10
12
10
22
2
14
10
18
11
15
3
12
13
19
11
14
4
16
12
14
22
16
5
12
15
19
26
23
Which salesperson should be assigned to each region to minimize total time? Identify the optimal assignments and compute total minimum time.

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