A clock loses exactly two minutes every single hour. If the clock is set to the correct time right now, how long will it take for the clock to show the exact correct time again?
30 days
A clock must lose a full 12 hours (720 minutes) to look correct again. Since it loses 2 minutes every hour, it takes 360 hours to drift by 12 hours. Dividing 360 hours by 24 hours in a day gives exactly 15 days? Wait, let's recalculate: 720 minutes / 2 minutes per hour = 360 hours. 360 / 24 = 15 days.
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.
More logic riddles
A row goes: clock, clock, calendar, clock, clock, calendar, clock, clock. What comes next?
A line goes: firework, party hat, firework, party hat, firework. What comes next?
Five houses in a row are painted distinct colors: Red, Blue, Green, Yellow, and White. The Green house is directly to the right of the Red house. The White house is at one of the ends. The Yellow house is not next to the Blue house. If the Blue house is in the middle (3rd position), what color is the 1st house on the left?
A man is looking at a photograph of someone on the wall. His friend asks, 'Whose picture are you looking at?' The man replies: 'Brothers and sisters have I none, but that man's father is my father's son.' Who is in the photograph?
Three colored envelopes—Red, Blue, and Yellow—stand on a table. Exactly one of them contains a hidden key. Each envelope has a message printed on it: - Red: 'The key is not in this envelope.' - Blue: 'The key is in the Red envelope.' - Yellow: 'The key is not in this envelope.' If only one of the three messages is true, which envelope holds the key?
A man pushes his car to a hotel and tells the hotel owner he is bankrupt. Why?