Two clocks are set to 12:00 Midnight. Clock A gains 2 minutes every hour. Clock B loses 3 minutes every hour. How many hours will pass before Clock A is exactly 1 hour ahead of Clock B?
12 hours
Every hour, Clock A gains 2 minutes relative to real time and Clock B loses 3 minutes, creating a 5-minute gap per hour between them. To reach a 60-minute difference: 60 / 5 = 12 hours.
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: Medium. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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