Activity R on a CPM network has predecessors M and N,and has successor S.R has duration 5.N's late finish is 18,while M's is 20.S's late start is 14.Which of the following is definitely true?
A)R is critical and has zero slack.
B)R has no slack but is not critical.
C)The set of times cannot all be possible.
D)N is a critical activity.
E)S is a critical activity.

Question

Quizplus · Accepted Answer

The late start of S (14) minus the duration of R (5) gives a late finish for R of 9, which is inconsistent with the late finishes of M (20) and N (18), indicating a contradiction in the given times.

Activity R on a CPM Network Has Predecessors M and N,and