Operations Management: Processes and Supply Chains (12th Edition) (What's New in Operations Management)
12th Edition
ISBN: 9780134741062
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 1P
Bill’s Barbershop has two barbers available to cut customers’ hair. Both barbers provide roughly the same experience and skill, but one is just a little bit slower than the other. The process flow in Figure 5.9 shows that all customers go through Steps Bi and B2 and then can be served at either of the two barbers at Step B3. The process ends for all customers at Step B4. The numbers in parentheses indicate the minutes it takes that activity to process a customer.
- How long does it take the average customer to complete this process?
- What single activity is the bottleneck for the entire process?
- How many customers can this process serve in an hour?
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. Bill's Barbershop has two barbers available to cut customers' hair. Both barbers provide
roughly the same experience and skill, but one is just a little bit slower than the other. The
process flow in Figure 6.90 shows that all customers go through Steps B1 and B2 and then
can be served at either of the two barbers at Step B3. The process ends for all customers at
Step B4. The numbers in parentheses indicate the minutes it takes that activity to process a
customer.
Figure 6.9 Process Flow for Bill's Barbershop
B1
(10)
B2
B3-a
(15)
B3-b
(10)
B4
(9)
1. On average, how long does it take a customer to complete this process?
›. What single activity is the bottleneck for the entire process?
c. How many customers can this process serve in an hour?
The Union Manufacturing Company is producing two types of products: A and B. The demand
forecasts, batch size, and time standards follow:
Demand forecast (units/yr)
Product A
Product B
1,000
4,000
Batch size (units/batch)
Processing time (hr/unit)
20
10
3.2
4.5
Setup time (hr/batch)
10
20
Both products are produced on the same machine, called Mark I.
11) Using Table 4.1, what is the total number of hours required of Mark I equipment for the next
year?
A) fewer than 29,000 hours
B) between 29,000 and 30,000 hours
C) between 30,000 and 31,000 hours
D) more than 31,000 hours
The Holt Million Corporation’s plant manufactures two different products: X and Y. The plant has three different machines: A, B, and C. Each performs different tasks and can work on only one unit of material at a time. Details for each product are shown in the table below:
Product
X
Y
Demand Per Week
200 units
100 units
Selling Price
$150
$160
Machine Operation Required
A, B, C
B, B, C
Operation Times in Minutes
20, 15, 15
15, 15, 15
Raw Materials Needed
RM-1, RM-2
RM-2, RM-3
Raw Materials Costs
RM-1 = $40/unit, RM-2 or RM-3 = $20/unit
Each product uses raw materials with costs as shown in the above table where the processing times and the machine required for each operation are also shown. Each machine is available 4,800 minutes per week. There are no system foul-ups. Demand is deterministic (i. e., no uncertainty). Operating expenses, including labor (but excluding raw materials) total $12,000 per week.
Assuming…
Chapter 5 Solutions
Operations Management: Processes and Supply Chains (12th Edition) (What's New in Operations Management)
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