Francisco is planning a vacation to Germany. A variety of activities must be com

Question

Francisco is planning a vacation to Germany. A variety of activities must be completed before his departure. The following table describes the relationships between these activities:

   Immediate
Activity      Predecessors
     A                   -
    B                   -
     C                   -
     D                  A, B
     E                  C
     F                   D, E
     G                  E
     H                  F, G
      I                   F
     J                   I, H

Francisco was also able to estimate the activity times as shown in the table below:

Activity         Time (Days)
     A                      3
     B                      4
     C                      5
     D                      3
     E                      2
     F                      1
     G                      4
     H                      3
     I                       2
     J                      5

Considering the information above, what is the slack for activities F and G respectively? (Points : 3)        0 days; 0 days
       3 days; 0 days
       4 days; 3 days
       4 days; 0 days

Explanation / Answer

Activity Predecessor Activity Time ES EF LS LF Slack A None 3 0 3 1 4 1 B None 4 0 4 0 4 0 C None 5 0 5 0 5 0 D A,B 3 4 7 4 7 0 E C 2 5 7 5 7 0 F D,E 1 7 8 10 11 3 G E 4 7 11 7 11 0 H F,G 3 11 14 11 14 0 I F 2 8 10 12 14 4 J I,H 5 14 19 14 19 0 ES = E of Tail Event EF = ES + Activity Duration LF = L of Head Event LS = LF - Activity Duration Slack - LS - ES E = Earliest occurrence time for the event L = Latest allowable time for the occurrence of event Slack for activities F and G are 3 and 0 respectively. Hence the correct asnwer is Option B

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