What is the early start time for Activity D given the activity times and precedence requirements shown in the table? $$\begin{array} { | l | l | l | }
\hline \text { Activity } & \text { Time } & \text { Predecessor } \
\hline A & 5 & - \
\hline \text { B } & 6 & A \
\hline \text { C } & 4 & A \
\hline D & 5 & \text { B, C } \
\hline
\end{array}$$
A) 7
B) 9
C) 11
D) 13

Question

What is the early start time for Activity D given the activity times and precedence requirements shown in the table? $$\begin{array} { | l | l | l | } 
\hline \text { Activity } & \text { Time } & \text { Predecessor } \
\hline A & 5 & - \
\hline \text { B } & 6 & A \
\hline \text { C } & 4 & A \
\hline D & 5 & \text { B, C } \
\hline
\end{array}$$
A) 7
B) 9
C) 11
D) 13

Quizplus · Accepted Answer

Activity D has two predecessors, B and C, both of which must finish before D can start. The earliest start time for D is therefore the maximum of the two earliest finish times of B and C.

The earliest finish time for B is its early start time (which is also the early finish time of A) plus its duration, or 5 + 6 = 11. 
The earliest finish time for C is its early start time (which is also the early finish time of A) plus its duration, or 5 + 4 = 9. 
Therefore, the earliest start time for D is the maximum of these two, which is 11.

Hence, the answer is C) 11.

What Is the Early Start Time for Activity D Given