Networks and decision maths HELP!!! needed

[Wezanator123]

I really need help on delaying projects and crashing them. How do you do them ?

E.g. In 2005 VCAA exam 2 : F's duration is 20 mins and EST is 18 and LST is 30

c) during the repair to this delivery van it is found that activity F will take loonger than usual 20 mins

i) explain why the duration of activity F can be increased without delaying this repair
ii) What is the max duration of activity F that will not delay completion of this repair ?

[99.96]

I havent acctually seen the question, but is i'm guessing its because of this:

i) because F does not lie on the critical path
ii) Find the float time:
LST-EST = 12
So F has 12 hours float
so 12+20 = 32