MAT 540 Week 10 Homework Chapter 6

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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

 

 

 

 

             
               
       

 

 

 

 

 

 

 

 

 

 

 

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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