Q1) Hospital emergency room (ER) is presently organized so that all patients register through initial check-in process. At his or her turn, each patient is seen by doctor and then exits process, either with prescription or with admission to hospital. Presently, 50 people per hour arrive at ER, 10% of whom are admitted to hospital. On average, 30 people are waiting to be registered and 40 are registered and waiting to see doctor. Registration process takes, on average, 2 minutes per patient. Among patients who get prescriptions, average time spent with doctor is 5 minutes. Among those admitted to hospital, average time is 30 minutes. On average, how long does patient stay in ER? On average, how many patients are being examined by doctors? On average, how many patients are in ER?