I’m working on a engineering question and need the explanation and answer to help me learn.

 A gantry is to be built on the side of a steep hill as shown below.After installing foundations for the identical towers A and B, a plinth has to be erected for tower B to compensate for the hill slope. On completion of the plinth a sighting is taken from its top to determine the height of base to be constructed for tower A to ensure final levelling. The foot of each tower is clamped in position by a series of securing plates fitted to base A and the plinth.The activities to be considered with their estimated duration and manpower requirements are:SerialActivityDuration (days)MenAMark out site13BDig foundation A24CConcrete foundation A12DBuild base A12EFit securing plates for A12FErect tower A33GDig foundation B44HConcrete foundation B32IErect Plinth24JFit securing plates for B12KErect tower B33LErect span14a) Produce an ctivity on arrow.etwork for the project identifying the critical path and determine the minimum duration of the project in days. Show total float and free float on your network.b) Produce a tabulated, job oriented, analysis of the networkc) Produce a bar chart representation of the network and a resource diagram for the project .Teesside University Open Learning (Engineering) EESSIDE UNIVERSITY 2021d) What will be the effect if the digging of foundation A (activity B) was extended toi) 6 Daysii) 8 dayse) If the maximum number of men available on any day was six, could the project be completed in the minimum time determined in part a) assuming the digging of foundation A took the two days scheduled.