8. The monthly maintenance work in a machine shop consists of 10 steps A to J. The inter-relationship between them are identified by event numbers:

Steps Event Numbers Duration (Days)

A 1-2 3 B 2-3 5 C 2-4 8 D 3-5 4 E 3-6 2 F 4-6 9 G 4-7 3 H 5-8 12 I 6-8 10 J 7-8 6

a. Draw a Network.

b. Compute early and late start and finish time for each activity.

c. How much slack does Activity (3-5), Activity (4-6) and Activity (7-8) have?

d. Identify the critical path and critical activities.

e. If Activity (2-3) takes 8 days instead of 5 days what will be the project completion time?

f. Identify the activities that have a free slack.