5 Hiro has been asked to organise a quiz.
The table below shows the activities involved, together with the immediate predecessors and the duration of each activity in hours.
| Activity | Immediate predecessors | Duration (hours) |
| A | Choose the topics | - | 0.5 |
| B | Find questions for round 1 | A | 2 |
| C | Check answers for round 1 | B | 2.5 |
| D | Find questions for round 2 | A | 2 |
| E | Check answers for round 2 | D | 2.5 |
| F | Choose pictures for picture round | A | 1 |
| G | Get permission to use pictures | F | 1.5 |
| H | Choose music for music round | A | 2 |
| I | Get permission to use music | H | 1.5 |
| J | Produce answer sheets | G | 0.5 |
- A sketch of the activity network is provided in the Printed Answer Booklet.
Apply a forward pass to determine the minimum project completion time.
- Use a backward pass to determine the critical activities.
You can show your working on the activity network from part (a).
- Give the total float for each non-critical activity.
Hiro decides that there should be a final check of the answers which he will include as activity \(L\).
Activity L needs to be done after checking the answers for rounds 1 and 2 and also after getting permission to use the pictures and music but before producing the answer sheets.
- Complete the activity network provided in the Printed Answer Booklet to show the new precedences, with the final check of the answers included as activity \(L\).
- As a result of including L , the minimum project completion time found in part (a) increases by 2.5 hours.
Determine the duration of L .