Given the following information: Activity Duration 1-2 4 2-4 9 4-7 5 7-10 2 10-1

Question

Given the following information:

Activity

Duration

1-2

4

2-4

9

4-7

5

7-10

2

10-12

3

2-5

8

5-8

7

8-10

2

1-3

10

3-6

6

6-9

4

9-11

5

11-12

6

What is the ES (earliest start time) of activity 10-12? (Fill in only number, no unit.)

What is the LF (latest finish time) of activity 10-12? (Fill in only number, no unit.)

What is the LF of activity 1-2? (Fill in only number, no unit.)

What is the expected duration of this project? (Fill in only number, no unit.)

Activity

Duration

1-2

4

2-4

9

4-7

5

7-10

2

10-12

3

2-5

8

5-8

7

8-10

2

1-3

10

3-6

6

6-9

4

9-11

5

11-12

6

Explanation / Answer

The above questions can be answered by making a table for the given project data

Based on the above calculations,

ES of activity 10-12 is 22

LF of activity 10-12 is 31

LF of activity 1-2 is 4

Expected duration of the project is 31

Activity Duration ES LS EF LF 1-2 4 0 4 0 4 1-3 10 0 10 0 10 2-4 9 4 13 12 21 2-5 8 4 12 11 19 3-6 6 10 16 10 16 4-7 5 13 18 21 26 5-8 7 12 19 19 26 6-9 4 16 20 16 20 7-10 2 18 20 26 28 8-10 2 20 22 26 28 9-11 5 20 25 20 25 10-12 3 22 25 28 31 11-12 6 25 31 25 31

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