|The Spider and the Fly
A room is 15 metres long, 4 metres wide and 3 metres high.
A spider on the centre line of the west wall of the room, one metre above the floor, sees a fly asleep on the centre line of the east wall, one metre below the ceiling.
The spider wants to get to the fly and eat it as soon as possible.
Which is the shortest path for the spider to get to the fly and what is the length of this path?