A grandfather clock chimes 6 times in 5 seconds. How many seconds does it take for the clock to chime 12 times, assuming the interval between each chime is constant?
11 seconds
6 chimes create 5 intervals between them. If 5 intervals take 5 seconds, each interval is 1 second. 12 chimes create 11 intervals, which takes 11 seconds.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Hard. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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