Two activities on different critical paths that share no common nodes are candidates for crashing on a CPM network. Activity details are in the table below. To cut one day from the project's duration, the manager should crash activity(ies) ________, adding ________ to project cost.
A) B; $2,000
B) C; $2,000
C) C; $1,000
D) B & C; $3,000
E) B & C; $4,000

Question

Two activities on different critical paths that share no common nodes are candidates for crashing on a CPM network. Activity details are in the table below. To cut one day from the project's duration, the manager should crash activity(ies) ________, adding ________ to project cost. 
A) B; $2,000 
B) C; $2,000 
C) C; $1,000 
D) B & C; $3,000 
E) B & C; $4,000

Quizplus · Accepted Answer

To cut one day from the project's duration, we need to find activities that have float times of one day. The activities on critical path A-B-E have no float time.

Activity B has a duration of 5 days and costs $8,000. Crashing it by one day will increase the cost by $2,000/day, so crashing it by one day will add $2,000 to the project cost.

Activity C has a duration of 4 days and costs $6,000. Crashing it by one day will increase the cost by $2,000/day, so crashing it by one day will add $2,000 to the project cost.

Therefore, crashing activity B and C will cut one day from the project's duration and add $3,000 to the project cost. So the best choice is D.

Two Activities on Different Critical Paths That Share No Common