Question

A project has six activities (A to F) with respective activity durations 7, 5, 6, 6, 8, 4 days. The network has three paths A - B, C - D and E - F. All the activities can be crashed with the same crash cost per day. The number of activities that need to be crashed to reduce the project duration by 1 day is

• A. 1
• B. 6
• C. 2
• D. 3

Answer 1

The correct option is D 3

The network diagram for the given project is,


Since, all the paths have 12 days duration, so all three paths will be critical paths.

To reduce the project duration by 1 day, one activity from each path should be crashed.

Hence total number of activities that should be crashed are 3.