Final answer:
To find the early start time for activity A5, we calculate the end of the previous activity, A3, which starts on day 12 and has a duration of 4 days. A5 can start immediately after A3, therefore the early start time for A5 is day 16.
Step-by-step explanation:
The question asks for the early start time for activity A5. Since the task list doesn't provide direct predecessor information or constraints, we'll assume a sequential task list where each activity starts as soon as the previous one finishes. Therefore, first we need to sum the durations of all prior tasks to determine when A5 can start.
A1 starts at early start time 5 days and lasts for 7 days, so it finishes on day 12.
A3 starts as soon as A1 ends, so it starts on day 12, has a duration of 4 days, and thus finishes on day 16.
Assuming no delays or other constraints, A5 can start right after A3, making its early start time day 16.