At a Dental Office, patients come in at the rate of 25 per hour and, on average, are processed at the same rate. Patients wait in a queue till they are called up to the counter for registration. After registration, patients are taken to a room where they are assigned a chair where they wait till a hygienist is ready to see them. Once a hygienist sees the patient, they identify them as a routine cleaning or they identify a problem where a dentist is needed to perform major treatments. On average, it is found that there are 25 patients waiting for registration and another 25 waiting to be seen by a hygienist. On average, how long do patients spend waiting in the dental office, i.e. time, T ?