A project has the precedence requirements and activity durations shown in the table.After he draws the network,the project manager decides that activities E and F can be represented by a hammock activity.What are the duration and the early start time associated with this hammock activity? $$\begin{array} { | l | l | l | }
\hline & \text { Tirne } & \text { Predecessor } \
\hline \mathrm { A } & 7 & \
\hline\mathrm { B} & 8 & \mathrm {~A} \
\hline \mathrm { C } & 13 & \mathrm {~B} \
\hline \mathrm { D } & 8 & \mathrm { C } \
\hline \mathrm { E } & 7 & \mathrm {~A} \
\hline \mathrm { F } & \mathrm { E } & \mathrm { E } \
\hline \mathrm { G } & 6 & \mathrm {~A} \
\hline \mathrm { H } & 6 & \mathrm { G } \
\hline \mathrm { I } & 11 & \mathrm { H } \
\hline \mathrm { J } & 12 & \mathrm { D } , \mathrm { F } , \mathrm { I } \
\hline
\end{array}$$
A)13,36
B)7,0
C)13,7
D)7,14

Question

A project has the precedence requirements and activity durations shown in the table.After he draws the network,the project manager decides that activities E and F can be represented by a hammock activity.What are the duration and the early start time associated with this hammock activity? $$\begin{array} { | l | l | l | } 
\hline & \text { Tirne } & \text { Predecessor } \
\hline \mathrm { A } & 7 & \
\hline\mathrm { B} & 8 & \mathrm {~A} \
\hline \mathrm { C } & 13 & \mathrm {~B} \
\hline \mathrm { D } & 8 & \mathrm { C } \
\hline \mathrm { E } & 7 & \mathrm {~A} \
\hline \mathrm { F } & \mathrm { E } & \mathrm { E } \
\hline \mathrm { G } & 6 & \mathrm {~A} \
\hline \mathrm { H } & 6 & \mathrm { G } \
\hline \mathrm { I } & 11 & \mathrm { H } \
\hline \mathrm { J } & 12 & \mathrm { D } , \mathrm { F } , \mathrm { I } \
\hline
\end{array}$$
A)13,36
B)7,0
C)13,7
D)7,14

Quizplus · Accepted Answer

To use a hammock activity, we need to identify non-critical activities that can be measured by time instead of by predecessor activities. Activities E and F don't have any successor activities and can be completed in parallel, so they can be represented by a hammock activity.

The duration of the hammock activity will be the difference between the latest finish time of activity E and the earliest start time of activity F.

We can calculate the early start time of the hammock activity by finding the earliest start time of activity E, which is 23, and subtracting it from the duration of the hammock activity.

Therefore, Hammock Activity duration = Latest Finish Time of E - Earliest Start Time of F
                                   = 36 - 23
                                   = 13

Hammock Activity Early Start Time = Earliest Start Time of E
                                                    = 23

Therefore, the correct answer is C) 13,7.

A Project Has the Precedence Requirements and Activity Durations Shown