Paper 1 · network analysis
In the network diagram shown, what is the earliest start time (EST) of activity F, in days?
Model answer
9
Also accepted: 9 days
Explanation: Activity F cannot begin until both of its preceding paths are complete: A then C takes 5+4=9 days, and B then D takes 3+6=9 days. Since both paths must finish first, the earliest start time for F is 9 days.
Derived from ZIMSEC Business_studies Paper 1, November 2019, Q7
