A grandfather clock takes exactly 5 seconds to chime 6 times at six o'clock. Assuming the strikes are evenly spaced, how many seconds will it take to chime 12 times at noon?
11 seconds
The 6 strikes define 5 intervals between chimes. Since 5 intervals take 5 seconds, each interval is 1 second. Twelve strikes involve 11 intervals, taking 11 × 1 = 11 seconds.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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