A rectangular box is 30 units long, 12 units
wide, and 12 units high. A Spider starting from spot A should reach
spot B. Spot A is midway from the sides of the box and 1 unit from its
top. Spot B is midway from the sides of the box, 1 unit from the
bottom of the box, and on the opposite side from A. The box, its
dimensions and the proper locations of spots A and B are shown in the
What is the shortest way for the Spider to reach spot B? During the
journey from A to B the Spider can use any side and edge of the box.
Hint: the shortest distance between A and B is less than 42 units.