Kristen and her roommate are in the business of baking custom cookies.As soon as
ID: 356342 • Letter: K
Question
Kristen and her roommate are in the business of baking custom cookies.As soon as she receives an order by phone, Kristen washes the bowl and mixes dough according to the customer's order-activities that take a total of 6 minutes. She then spoons the dough onto a tray that holds 1 dozen cookies (2 minutes). Her roommate then takes 1 minute to set the oven and place the tray in it. Cookies are baked in the oven for 9 minutes and allowed to cool outside for 5 minutes.The roommate then boxes the cookies (2 minutes) and collects payment from the customer1 minute) Suppose that each order consists of 2 dozen cookies. Assume that although the mi:x ing bowi can accommodate dough for 2 dozen cookies at a time, the oven can ac commodate only 1 tray of 1 dozen cookies at a time. As before, spooning each tray takes 2 minutes, and both trays must be cooled prior to boxing the cookies for cus- tomer pickup. Draw a modified flow chart and determine theoretical flow time. Con- sider the effect on flow time of the following possible alternatives to the system 1. Buying a second oven that can bake 1 tray of 1 dozen cookies, 2. Buying a second oven that can hold 2 trays of 1 dozen cookies each 3. Buying a faster convection oven that can bake 1 dozen cookies in 6 minutes instead of 9Explanation / Answer
Question 1.
Activity 1: Mixing Cookie Dough(6 mins)
Activity 2: Spooning Cookie Dough(2 mins)
Activity 3: Setting Oven(1mins)
Activity 4: Baking 12 Cookies(9 mins)
Activity 5: Cooling Cookies(5 mins)
Activity 6: Packing(2 mins)
Activity 7: Payment(1 min)
B. Suppose if
6+2+1+9+5+2+1 = 26 mins is taken for this activity
an order is for 2 dozen cookies and there is only one oven:
Activity 1: Mixing Cookie Dough(6 mins)
Activity 2: Spooning Cookie Dough(2 mins)
Activity 3: Setting Oven(1mins)
Activity 4: Baking 12 Cookies(9 mins)
Activity 5: Cooling dozen Cookies(5 mins)
Activity 6: Baking another dozen cookies(9 mins)
Activity 7: Cooling Cookies(5 mins)
Activity 6: Packing(2 mins)
Activity 7: Payment(1 min)
Total Time: 6+2+1+9+(9-5)+(5-2)+2+1 = 28 mins total
C. Buying a second Oven that can bake 1 tray of 1 dozen Cookies:
Activity 1: Mixing Cookie Dough(6 mins)
Activity 2: Spooning Cookie Dough(2 mins)
Activity 3: Setting Oven(1mins)
Activity 3: Setting second oven(1 min)
Activity 4: Baking 12 Cookies(9 mins)
Activity 4: Baking second set of 12 cookies(9 mins)
Activity 5: Cooling Cookies(5 mins)
Activity 5: Cooling second set(5 mins)
Activity 6: Packing(2 mins)
Activity 7: Payment(1 min)
Thus total time = 6+2+1+9+5+2+1 = 26 mins total since two activities in parallel
D. Second Oven with Capacity of 2 dozen cookies:
Activity 1: Mixing Cookie Dough(6 mins)
Activity 2: Spooning Cookie Dough(2 mins)
Activity 3: Setting Oven(1mins)
Activity 4: Baking 24 Cookies(9 mins)
Activity 5: Cooling Cookies(5 mins)
Activity 6: Packing(2 mins)
Activity 7: Payment(1 min)
Total Time = 6+2+1+9+5+2+1 = 26 mins total
E. Faster Convection Oven
Activity 1: Mixing Cookie Dough(6 mins)
Activity 2: Spooning Cookie Dough(2 mins)
Activity 3: Setting Oven(1mins)
Activity 4: Baking 12 Cookies(6 mins)
Activity 5: Cooling Cookies(5 mins)
Activity 6: Baking 12 Cookies(6 mins)
Activity 7: Cooling Cookies(5 mins)
Activity 8: Packing(2 mins)
Activity 9: Payment(1 min)
Total Time = 6+2+1+6+(6-5)+(5-2)+2+1 = 22 mins total
Total Time:B. Suppose if
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