Problems 3.15-3.16 relate to Determining the Project Schedule 3.15 Dave Fletcher (see Problem 3.12) was able to deter- mine the activity times for constructing his laser scanning machine. Fletcher would like to determine ES, EF, LS, LF, and slack for each activity. The total project completion time and the critical path should also be determined. Here are the activity times: ACTIVITY TIME (WEEKS) ACTIVITY TIME (WEEKS) A 6 E 4 B 7 F 6 3 G 10 D 2 H 7 ...3.16 The Rover 6 is a new custom-designed sports car. An analysis of the task of building the Rover 6 reveals the following list of relevant activities, their immediate predecessors, and their duration: JOB LETTER IMMEDIATE PREDECESSOR(S) NORMAL TIME (DAYS) DESCRIPTION A Start 0 B Design A 8 Order special accessories B 0.1 D Build frame B 1 E Build doors B 1 F D 1 Attach axles, wheels, gas tank G Build body shell B 2 H B 3 Build transmission and drivetrain I Fit doors to body shell G, E 1 J Build engine B 4 K Bench-test engine J 2 L Assemble chassis F, H, K 1 M Road-test chassis L 0.5 N Paint body I 2 O Install wiring N 1 P Install interior N 1.5 Q Accept delivery of 5 special accessories R M, O, P, Q 1 Mount body and accessories on chassis S Road test car R 0.5 T Attach exterior trim S 1 U Finish T 0 a) Draw a network diagram for the project. b) Mark the critical path and state its length. c) If the Rover 6 had to be completed 2 days earlier, would it help to: i) Buy preassembled transmissions and drivetrains? ii) Install robots to halve engine-building time? iii) Speed delivery of special accessories by 3 days? d) How might resources be borrowed from activities on the non- critical path to speed activities on the critical path? PX