At CDE dental office, on average, 40 patients arrive every hour and are processed at the same rate. Patients wait in line for registration. On average, it takes 6 minutes for registration, not including waiting time. A dentist's assistant sees a patient after registration and assigns the patient to one of the two tracks, one for routine cleanings and another for major treatments. On average, the dentist's assistant spends 15 minutes with each patient. On average, 3/4 (or 75%) of the patients are classified by the dentist's assistant as needing routine cleanings. Patients for routine cleaning are seen by a hygienist who cleans their teeth and releases them. On average, this takes 40 minutes. Patients for major treatment are seen by a dentist for further treatment. On average, this takes 1 hour. It is observed that there are, on average, 8 people waiting to be registered, 10 waiting to be seen by the dentist's assistant, 10 waiting to be seen by a hygienist in the routine cleaning area, and 15 waiting to be seen by a dentist in the major treatment area.

What is the theoretical flow time of a patient for routine cleaning

After registration, what is the average waiting time (in minutes) to be seen by the dentist

What is the theoretical flow time of a patient for major treatment

After registration, what is the average waiting time (in minutes) to be seen by the dentist's assistant?

After registration, what is the average waiting time (in minutes) to be seen by a hygienist

what percentage is the flow-time effciency of a patient for major treatment?