Inside a rectangular room, measuring 30 feet in length, 12 feet in width, and 12 feet high, a spider is at a point in the middle of one of the end walls 1 inch from the ceiling (point A). A fly is on the center of the opposite wall 1 inch from the floor (point B). What is the shortest distance that the spider must crawl to reach the fly if the fly remains stationary. Of course, the spider never drops or uses its web, but crawls.