Question 4 (5 marks) To restore a vintage train, 13 activities need to be completed. The network below shows these 13 activities and their completion times in hours. C,6 G, 3 4,5 1D, 2 H,4 K,7 E, 2 L, 3 start finish B, 5 F,4 1,3 *M,6 J, 2 a. Determine the earliest starting time of activity F.

The minimum time in which all 13 activities can be completed is 21 hours.
b. What is the latest starting time of activity L?

C. What is the float time of activity J?

Just before they started restoring the train, the members of the club needed to add another activity, X, to the project Activity X will take seven hours to complete. Activity X has no predecessors, but must be completed before activity G starts.
d. What is the latest starting time of activity Xif it is not to increase the minimum completion time of the project? 1 mark​