PROBLEMS ON PROCESS FLOW 11. Judy\'s cake shop makes fresh cakes to customer ord
ID: 326930 • Letter: P
Question
PROBLEMS ON PROCESS FLOW 11. Judy's cake shop makes fresh cakes to customer orders. After receiving the order by Judy's assistant, which takes 2 minutes, Judy then takes 8 minutes to mix the ingredients for the cake and loads a cake pan for baking. Then the cake is put into the oven for 30 minutes. The oven can hold 3 cakes at one time. When the cake is taken out of the oven it is cooled for 1 hour. The assistant then takes 2 minutes to pack the cake for pickup and bills the customer, taking 3 minutes. A. What is the process capacity and what is the bottleneck? B. What is the throughput time for a typical cake? C. If on average 5 orders are taken per hour, how many cakes are there in the process (work in process inventory)
Explanation / Answer
Answer to question A :
Following are the steps and corresponding processing time :
Receiving the order = 2 minutes
Mixing ingredients and loading cake pan for baking = 8 minutes
Putting cake in oven = 30 minutes
Cooling of cake = = 60 minutes ( i.e. 1 hour )
Packing the cake = 120 seconds ( i.e. 2 minutes )
Billing the customer = 180 seconds ( i.e. 3 minutes )
The bottleneck step is the one which has maximum processing time which in this case is “Cooling of cake “ taking 1 hour time for each cake. Since process capacity is decided by the bottleneck step as arrived above , process capacity is 1 cake per hour
Answer to question B :
Since the oven can handle 3 cakes simultaneously, effective processing time at oven = 30 /3 = 10 minutes per cake
Throughput time of a typical cake
= Throughput time of receiving the order step + Thorughput time of making ingredients + Effective baking time in oven + Thorughput time of cooling a cake + throughput time of packing the cake + Throughput time of billing the customer
= 2 + 8 + 10 + 60 + 2 + 3 minutes
= 85 minutes
Answer to question C:
Rate of order taking = R = 5 orders per 60 minutes
Throughput time = T = 85 minutes
Therefore , number of cakes in the process ( as Per Little’s Law ) = R x T = 5/60 X 85 = 7.08 ON VEARGE
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