Inside a rectangular room, measuring 30 feet in
length and 12
width and height, a spider is at a point on the middle of one of the
walls, 1 foot from the ceiling, as at A; and a fly is on the opposite
wall, 1 foot from the floor in the centre, as shown
What is the
shortest distance that the spider must crawl in order to reach the fly,
which remains stationary?
Of course the spider never drops or uses its
web, but crawls fairly.