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.

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 toi) 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 noncritical path to speed activities on the critical path?

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ACTIVITY A B n D E LL 1 J K L M N O P Q G Build body shell H R DESCRIPTION S T U Start Design Order special accessories Build frame Build doors Attach axles, wheels, gas tank Build transmission and drivetrain Fit doors to body shell Build engine Bench-test engine Assemble chassis Road-test chassis Paint body Install wiring Install interior Accept delivery of special accessories Mount body and accessories on chassis Road test car Attach exterior trim Finish TIME IMMEDIATE (DAYS) PREDECESSOR(S) 0 8 0.1 1 1 1 2 WN 3 1 4 2 1 0.5 2 1 1.5 5 1 0.5 1 A B BBD В В B B G, E B J F, H, K L T N N C M, O, P, Q RST