Consider a project consisting of four activities A, B, C, and D. The following are constraints within which the project has to be conducted

A and B, the first activities of the project, can be started simultaneously. C can be started only after A is completed. D can be started only after B is completed

Suppose the activity times for the activities are A = 4 weeks, B = 3 weeks, C = 2 weeks, D = 4 weeks. 1. How long does the project take to complete?

Suppose there is another activity E that takes 5 weeks to complete. Additional analysis reveals that E can also be started only after both B and C are completed. 2. How long does the project take to complete now?