Lead Time Calculation for a Service Company Marcus Simmons caught the flu and needed to see the doctor. Simmons called t...
Lead Time Calculation for a Service Company
Marcus Simmons caught the flu and needed to see the doctor. Simmons called to set up an appointment and was told to come in at 1:00 P.M. Simmons arrived at the doctor's office promptly at 1:00 P.M. The waiting room had 5 other people in it. Patients were admitted from the waiting room in FIFO (first-in, first-out) order at a rate of 5 minutes per patient. After waiting until his turn, a nurse finally invited Simmons to an examining room. Once in the examining room, Simmons waited another 5 minutes before a nurse arrived to take some basic readings (temperature, blood pressure). The nurse needed 10 minutes to collect this clinical information. After the nurse left, Simmons waited 30 additional minutes before the doctor arrived. The doctor diagnosed the flu and provided a prescription for antibiotics, which took 5 minutes. Before leaving the doctor's office, Simmons waited 10 minutes at the business office to pay for the office visit.
Simmons spent 5 minutes walking next door to fill the prescription at the pharmacy. There were four people in front of Simmons, each person requiring 5 minutes to fill and purchase a prescription. Simmons arrived home 15 minutes after paying for his prescription.
a. What time does Simmons arrive
home?
b. How much of the total elapsed time from 1:00 P.M. until when Simmons arrived home was non-value-added time?
| Total elapsed time | minutes |
| Non-value-added time | minutes |
c. What is the value-added ratio? Round your
percent to one decimal place.
%
Homework Answers
Answer :
| a). | ||
| Marcus arrived at doctor at doctor | 1 | Pm |
| Patients at waiting room | 5 | |
| Time taken by each patient | 5 | Min |
| Total time taken before Marcus | 25 | Mins |
| Time at which Marcus turn comes | 1.25 | Pm |
| Waiting time at examination room | 5 | Mins |
| Time before nurse arrives | 1.30 | Mins |
| Examination by nurse and collection time | 10 | Mins |
| Time till information | 1.40 | Pm |
| Waiting time for doctor | 30 | Mins |
| Time at which doctor arrives | 2.10 | Pm |
| Doctor examination time | 5 | Mins |
| Time at which doctor leaves | 2.15 | Pm |
| Wait to pay | 10 | Mins |
| Time at which he leaves | 2.25 | Pm |
| Time to reach pharmacy | 5 | Mins |
| Time at which he reaches pharmacy | 2.30 | Pm |
| Number of people at pharmacy | 4 | |
| Time taken by each person | 5 | Mins |
| Total time taken before Marcus | 20 | Mins |
| Time at which Marcus turn comes | 2.50 | Pm |
| Time taken by Marcus | 5 | Mins |
| Time at which he pays | 2.55 | Pm |
| Time taken to reach home | 15 | Mins |
| Time at which he reaches home | 3.10 | Pm |
| b). | ||
| Total elapsed time | 130 | Mins |
| Non Value Added time | ||
| Total time taken before Marcus | 25 | Mins |
| Waiting time at examination room | 5 | Mins |
| Waiting time for doctor | 30 | Mins |
| Wait to pay | 10 | Mins |
| Total time taken before Marcus | 20 | Mins |
| Total non value added time | 90 | Mins |
| c) | ||
| Value added time = Elapsed time - Non value added time | 40 | Mins |
| % value added time to total lead time (40/130*100) | 30.8%% |
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