4 Colin is setting off for a day's sailing. The table and the activity network show the major activities that are involved, their durations and their precedences.
| A | Rig foresail |
| B | Lower sprayhood |
| C | Start engine |
| D | Pump out bilges |
| E | Rig mainsail |
| F | Cast off mooring ropes |
| G | Motor out of harbour |
| H | Raise foresail |
| I | Raise mainsail |
| J | Stop engine and start sailing |
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- Complete the table in your answer book showing the immediate predecessors for each activity.
- Find the early time and the late time for each event. Give the project duration and list the critical activities.
When he sails on his own Colin can only do one thing at a time with the exception of activity G, motoring out of the harbour.
- Use the activity network to determine which activities Colin can perform whilst motoring out of the harbour.
- Find the minimum time to complete the activities when Colin sails on his own, and give a schedule for him to achieve this.
- Find the minimum time to complete the activities when Colin sails with one other crew member, and give a schedule for them to achieve this.