1) Pull the plug in the bath tub.
2) The correct answer is 6 rotations. Suppose you rotate the smaller wheel and the larger wheel together without rolling through one rotation clockwise, the small wheel has rotated through 1 turn clockwise. Now rotate the larger wheel back to its original position counter-clockwise through one rotation at the same time holding the center of the small wheel in the original position but allowing the wheel to rotate without sliding. It will rotate through 5 more turns due to the ratio of the circumferences of the wheels. The total number of rotations of the small wheel is 5 + 1 = 6.