When you post questions like this on the forum we ask that you please post the source of the question as well. Where did you find this question?
P.S. I agree with the 12 days answer. Process A starts on day 1 and ends on day 10. Process B starts on day 4 (3 day lag) and lasts for 9 days, ending on day 12. It is a FF relationship and the total duration is 12 days. I think that is correct.
I have been looking at this a bit more and I think you are actually correct. Actiivity A has a duration of 10 days and we need to count 3 days "lag" beyond day 10 which takes us through day 13. We count back 9 days from that to determine when activity B started which would be at the beginning of day 5. Total duration for A and B would then be 13 days as you stated. I had to remember that for a FF+3 relationship means that activity B finishes 3 days after activity A. My apology for any confusion as earlier, I had put the lag from the start of activity B and it needs to be added to the finish of activity A.
Was there any kind of Gantt chart or network diagram shown with the answer?
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