4.
| Activity | Time | Precedence |
| A | 12 | |
| B | 5 | |
| C | 10 | |
| D | 8 | A |
| E | 5 | A, B , C |
| F | 9 | C |
| G | 11 | D, E |
| H | 6 | G, F |
| I | 6 | H |
| J | 2 | H |
| K | 3 | I |
Construct an activity network to show the tasks involved in widening a bridge over the B451.
- Find those tasks which lie on the critical path and list them in order.
- State the minimum length of time needed to widen the bridge.
- Represent the tasks on a Gantt diagram.
Tasks \(F\) and \(J\) each require 3 workers, tasks \(B\), \(D\) and \(I\) each require 2 workers and the remaining tasks each require one worker.
- Draw a resource histogram showing how it is possible for a team of 4 workers to complete the project in the minimum possible time.