If 3 pipes can fill 3 tanks in 3 hours, how many hours will it take for 9 pipes to fill 9 tanks?
3
If 3 pipes fill 3 tanks simultaneously in 3 hours, then each pipe takes 3 hours to fill one tank. When 9 pipes fill 9 tanks simultaneously, each pipe still fills its own tank in 3 hours.
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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