25. For the AOE network below, (a) obtain the early, el ), and late l(), start times for activities a3 and a10 by using the forward-backward approach. (b) what is the earliest time the project can finish? (c) which activities are critical? (d) Is there any single activity whose speed up would result in a reduction of the project length? a = 6 24 = 1 2 10 = 2 a7 = 9 start 8 finish A2 = 4 ag = 7 ag = 1 a 11 = 4 2. Az = 5 29 = 4 3 6=2 26