Part of a surgical admitting process orderlies are available to escort patients to the pre-surgery preparation area. Patients are not allowed to go by themselves as a matter of policy. A Management Engineer walked the route briskly and found it took 2 minutes to walk to the prep area. Orderlies say that it sometimes takes as long as 7 minutes to escort a patient to the area, but it usually takes 5 minutes. Construct an input model for time to escort a patient based on the information given.