A clock loses 2 minutes every single hour. If the clock is set to the correct time right now, how many days will it take for the clock to show the exact correct time again?
15 days
A clock must lose a full 12 hours (720 minutes) to show the correct time again. At a rate of 2 minutes lost per hour, it takes 360 hours to lose 12 hours. Dividing 360 hours by 24 hours gives 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: Hard. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
A cube painted completely red on the outside is sliced into 27 identical smaller cubes using two cuts along each of the three spatial dimensions. How many of the small cubes have paint on exactly two of their faces?
Five runners finish a school marathon, and only these facts survive. Gwen finished ahead of Kira. Opal finished ahead of Boris. Boris finished ahead of Aria. Kira finished ahead of Opal. Who finished first?
Three boxes are labeled 'Apples', 'Oranges', and 'Mixed'. Every single label is known to be incorrect. Without looking inside, you are allowed to reach into just one box and draw out a single piece of fruit. Which box must you choose from to correctly relabel all three boxes?
A runner passes the person in second place during a marathon race. What exact position is the runner in now?
On a strange island, inhabitants either always tell the truth or always lie. You meet two residents, Pando and Qora. Pando states, 'Both of us are liars.' What are Pando and Qora?
A master thief leaves a safe behind with a note: 'The combination is a 4-digit number where the first digit is the number of zeros in the code, the second is the number of ones, the third is the number of twos, and the fourth is the number of threes.' What is the 4-digit combination?