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Pearson D1 Scheduling Diagram query

Discussion in 'Mathematics' started by EmmaLibby, Dec 9, 2019.

  1. EmmaLibby

    EmmaLibby New commenter

    I'm teaching D1 for the first time and had a query today that I could not answer...

    Page 253, Ex 8I, Question 3. After the first worker has finished activity C, why is activity F chosen over activity D, when D has the lowest late end time? This is skipped over in the worked solutions with no explanation.

    https://www.activeteachonline.com/default/player/splitzoom/id/750543/external/0

    Thanks.
     

    Attached Files:

  2. BG54

    BG54 Occasional commenter

    I'm not an expert on DM but is it because activity J cannot begin until G, H and I have all been completed and if you swap F and D over the minimum time that the project can be completed in is 26 days - or hours, not sure which it is as the solution gives days but the activities are in hours.

    The revised schedules for that option would be

    A-C-D-G-H with H finishing at 20 units

    B-E-F-I-J with J starting at 22 units and finishing at 26 units.

    Other options that I considered would have J starting before one of H or I was complete which is not allowed.
     

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