A project involves six tasks, some of which cannot be started until others have been completed. This is shown in the table below.
Task
Duration (minutes)
Immediate predecessors
A
18
-
B
23
-
C
13
\(A , B\)
D
9
A
E
28
\(B , D\)
\(F\)
23
C
Draw an activity network for this project.
By labelling your network, find the critical path and the minimum duration of the project.
An extra condition is now imposed. Task \(A\) may not begin until task \(B\) has been underway for at least 10 minutes.
Draw a new network taking into account this restriction.
Find a revised value for the minimum duration of the project and state the new critical path.