An office wants to install an information system. The main tasks are below, with time estimates in days and task dependencies indicated. Find the amount of time required to get the system up and running, and find the set of tasks which could delay the project if they were delayed.

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Task A. Run wiring B. Research hardware 1 2 Time (days) Predecessor none C. Research software D. Purchase hardware E. Purchase software 2242. none 2 none B C F. Install hardware 1 D, A G. Install software 1 E, F H. Install network facilities 1 F I. Set up database 4 G J. Train employees 5 H