A gear wheel has 12 teeth on the smaller wheel and 32 teeth on the larger one. Due to a manufacturing defect, one tooth on the small wheel and one gap on the large wheel are faulty, causing them to rattle when they meet. How often will we hear the rattling if the time for one revolution of the large wheel is 3 seconds? How can the rattling be eliminated if we assume that all other tooth-gap pairs are flawless and make contact silently?