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Solution to Kristen's Cookie Company (A)
Before answering specific questions, it is useful to make a diagram of the overall process:
Note that in this diagram, activities are arranged in columns to indicate which resources are being used. Inside each activity symbol are written the capacity (in dozens of cookies) and the cycle time (in minutes).
1. How long will it take for you to fill a rush order?
Assuming this order is for one dozen cookies, we will need to do the following:
Activity Resource Cycle Time Start Time Finish Time
Order Entry E-mail 0 minutes 00:00 00:00
Wash Bowl, Mix Self 6 minutes 00:00 06:00
Fill Tray Self 2 minutes 06:00 08:00
Prepare Oven Roommate 1 minute 08:00 09:00
Bake Oven 9 minutes 09:00 18:00
Remove Roommate 0 minutes 18:00 18:00
Cool None 5 minutes 18:00 23:00
Pack, Collect Money Roommate 3 minutes 23:00 26:00
Therefore, the minimum time to fill an order is 26 minutes. We can illustrate the sequence of events with a Gantt chart:
2. How many orders can you fill i ...