Time remaining: 1:51:44 4. value: 12.00 points Problem 6-11 Money Laundry has 22

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  Time remaining: 1:51:44  

4.

value:
12.00 points

Problem 6-11

Money Laundry has 22 washers and 34 dryers. All orders are first sent to wash and then to dry. It takes on average 42 minutes to wash one order and 38 minutes to dry.

a. What is the capacity of the washing stage? (Round your answer to 2 decimal places.)

Capacity of washing stage             orders per hour

b. What is the capacity of the drying stage? (Round your answer to 2 decimal places.)

Capacity of drying stage             orders per hour

c. Identify the bottleneck(s).

d. What is the capacity of Money laundry? (Round your answer to 2 decimal places.)

Capacity of Money laundry             orders per hour

e. If Money Laundry would like to increase the capacity by buying one more machine, should they buy a washer or a dryer?

The manager, Mr. Money, decided not to buy a machine. He still has 22 washers and 34 dryers. The manager estimates that on average Money Laundry receives four orders every hour. The manager also finds that on average there are three orders in the washing stage and two orders in the drying stage.

f. What is the utilization of washers, on average? (Round your answer to 2 decimal places.)

Average utilization             %

g. What is the utilization of dryers, on average? (Round your answer to 2 decimal places.)

Average utilization             %

h. On average, how long does it take an order to finish the washing process, from the time the order is received? (Round your answer to 2 decimal places.)

Average time taken             hour

i. On average, how long does it take an order to finish the drying process, from the time the order finishes the washing process? (Round your answer to 2 decimal places.)

Average time taken             hour

j. On average, how long does an order stay in Money Laundry? (Round your answer to 2 decimal places.)

Average time taken             hour

References

WorksheetDifficulty: 3 Challenge

Problem 6-11Learning Objective: 06-02 Understand production process mapping and Little's Law

Explanation / Answer

a. Total no. of washers is 22.
Average time taken to finish one order is 42 minutes,
The capacity of washing stage = 60 Min/ 42 Min = 1.42 orders per hr.

b. Total no. of dryers is 34.
Average time taken to finish one order is 38 minutes,
The capacity of drying stage = 60 Min/ 38 Min = 1.57 orders per hr.

c. Bottleneck is washer because when dryer complete 1.5 orders in one hour, washer can finish only 1.4 orders in one hour.  

d. Average time taken by washer is 42 minutes and by dryer is 38 minutes. So average time taken to complete one order is 42 Min + 38 Min = 80 Min. Therefore, capacity of Money Laundry to complete no. of orders in 1 hr is, 60 Min/ 80 Min = 0.75 orders per hour.

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