The tub of a washer goes into the spin cycle, beginning from rest and gaining angular speed steadily for 7.00 s, at which time it is turning at 3.00 rev/s. At this point, the person doing the laundry opens the lid, and a safety switch turns off washer. The tub smoothly slows to rest in 12.0 s. During how many revolutions does the tub turn as it is in motion?