Wash, mix, spoon

Bake
Cool
Pack
Accept Payment
6 + 2 min per dozen-
7.5 dozen per hour

1+9 min per dozen-
6 dozen per hour
5 min per dozen-
12 dozen per hour
2 min per dozen-
30 dozen per hour
1 min per dozen-
60 dozen per hour
Wash, mix, spoon

Bake
Cool
Pack
Accept Payment
6 + 2 min per dozen-
7.5 dozen per hour

1+9 min per dozen-
6 dozen per hour
5 min per dozen-
12 dozen per hour
2 min per dozen-
30 dozen per hour
1 min per dozen-
60 dozen per hour

1. How long will it take you to fill a rush order? * The rush time is the sum of the processing times for each of the steps. This equals 8+10+5+2+1=26 minutes.

2. How many orders can you fill in a night, assuming you are open four hours each night? * The bottleneck is in the oven: prepare + baking = 10 minutes. * The oven capacity is 6 trays/hour. * Since we work 4 hours, the process capacity = 4 X 6 = 24 trays/day, assuming that the first 8 minutes before baking and the last 8 minutes after baking are carried out during closing time. * The real capacity is 3.73 hours X 6 trays/hour = 22.4 trays.

* Total time available 240 min. * First order will take 26 min. Every successive order will take 10 minutes
Therefore
26+10n=240
N=21.4

Total No of orders which can be fulfilled=21+1=22

3. How much of your own and your roommate’s valuable time will it take to fill each order? % Utilization of You and Roommate * Kirsten:
Total minutes working=2+8=10minutes for each dozen
In an hour you do this 6 times.
Utilization=48/60=80%

* Roommate:
Total minutes working =1+2+1=4 minutes for each dozen
In one hour Total minutes6*4=24 minutes
Utilization=24/60=40%

4. Min number of baking trays will you need? * You will need more than one tray, assuming that the cookies will be on trays during the spool (raw cookies) and cool (baked cookies) stages. Hence, you will need at least three baking trays.

5. Are there any changes you can make in your production plans that will allow you to make better cookies or more cookies in less time or at lower cost? For example, is there a bottleneck operation in your production process that you can expand cheaply? What is the effect of adding another oven? How much would you be willing to pay to rent an additional oven?

* The suggestion is to buy or rent a new oven, which is also capable of holding one tray at a time. Thus, baking capacity would increase from 6 to 12 trays/hour.