Wrong answer in VCAA 2011? Or am I going crazy?

[Yendall]

Networks question 7:



If you created the network, it would look like this with forward and backward scanning:



The answer is 24 on the Assessors report, but wouldn't it be 34 if their theory is correct?

I thought the answer was 18. Because if he gets a phone call right when Andy begins, he has Activity K and L to talk on the phone before he has to start his activity.

[pi]

The answer is 24 because it says the activities must be done under 40 mins (what your diagram outlines is the fastest time for completion). Hence, if he took a call for 24 mins that would be the max time as 24+16=40.

I never did further so I could be wrong here haha



edit: typo due to autocorrect on phone...

[Yendall]

That seems pretty legit though haha thanks! I'll remember that, because this question is fairly annoying in terms of the study design.