(5) A small maintenance project consists of the following jobs whose precedence relationships are given below: Job 1-2 1-3 2-3 2-5 3-4 Immediate Predecessor 15 15 3 5 8 8 Activity 3-6 4-5 4-6 5-6 6-7 Immediate Predecessor 12 1 14 3 14 From the above information, you are required to: (a) construct a network diagram (b) compute the earliest event time and latest event time (c) determine the critical path and total project duration.