I'm just going to say this, without any attempt of including a said "case study" within your response, and without minimal referral to such "cases" I personally don't think it's necessarily logical that you can achieve within the same bands as those Effective responses which due address case...
I personally don't think you'll get the mark for stating recruitment. Saying this from similar experience in the trials. If it were a 2-4 marker, quite possibly. But for one mark, id say you would have had to be spot on the syll dot point.
i) Take the path, Task A -> Task C -> Task E -> Task F -> Task G, which would be 90 minutes. This path is taken as, in the time "25 minutes" it takes for Task C and Task E to be completed, simultaneously Task B and D can too be accomplished. If one was to utilise Task B and D as a basis...
assume tan(a) = 1/x
and tan(b) = x
effectively they'd be in the same right angled triangle, with sides, "1", "x" and hypotenuse "(x^2+1)^1/2.
a+b+90 = 180
arctan(1/x) + arctan(x) = 90
which is in effect, pi/2