What would happen if a new estimate for task d increases

Question

Each student should complete the following problem and submit a single file in Word or Excel with all requirements in either format.

Given the following information about a small project,

Task     Duration         Immediate

           Estimates        Predecessors

A          2 days              None

B          5 days              A

C          1 day               B

D          2 days              A

E          3 days              B & D

F          12 days            E  & C

1. Draw a network diagram.
2. Identify the critical path, earliest start and finish and slack for each task.
3. Using MS Excel, produce a Gantt chart for this project.
4. What would happen if a new estimate for task D increases its expected duration from two days to six days? Would the project take longer? Would anything else change?