Develop the activity sequence model or models and determine the normal time (minutes) for the following work activity: An operator, seated at a desk, stands, picks up a letter and walks 13 steps to a photocopy machine. The cover is raised and the original placed on the glass. The cover is closed. The operator then sets a button to make one copy. The start button is depressed, and a copying process time of six seconds follows. During the process time, the operator gains control of the cover and when the ready light appears, lifts the cover. The original is removed, the cover lowered and the operator picks up the copy, returns 13 steps to the desk, places the original and the copy on the desk and sits down (tip: 8 method steps).