A doctor's office has three resources: A receptionist registers and checks out patients; Two nurses do physical exams and prep patients to see a doctor; and three doctors see patients. Each patient is seen by the receptionists, one of the nurses and one of the doctors. The current capacity of the doctor's office is 85 patients per day (this is the maximum number of patients the doctor's office can see). The utilization of receptionist, nurses and physicians are 0.53, 0.28 and 0.35, respectively. Assuming all the other resources are available in abundance, what is the doctor's office's current flow rate in patient's per day?