A digital clock displays time in 12-hour format without leading zeros (e.g., 3:45 or 12:00). Between 1:00 PM and 5:00 PM, how many times will all three displayed digits (hours, tens of minutes, units of minutes) be identical?
4 times
The identical digit times occurring between 1:00 PM and 5:00 PM are 1:11, 2:22, 3:33, and 4:44. That makes a total of 4 times.
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: Easy. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
More logic riddles
I rise at night, change shape each week, and glow without a flame. What am I?
I am an odd number. Take away one letter from my name, and I become even. What number am I?
A padlock requires a 3-digit code using distinct digits from 1 to 9. 1. The sum of the three digits is 15. 2. The second digit is double the first digit. 3. The third digit is an odd number greater than the second digit. What is the 3-digit code?
Four travelers arrive at a narrow suspension bridge at night holding only one flickering torch. The bridge can safely support at most two people at a time. Their individual crossing times are 1, 2, 5, and 10 minutes. When two cross together, they must move at the speed of the slower person. What is the absolute minimum total time required for all four to reach the other side?
A grandfather, his son, and his grandson share the same birthday. The grandfather's age in years is equal to the grandson's age in months. The sum of all three of their ages is 120 years. How old is the father?
In a secure facility, a password must be formed using four distinct non-zero digits. The second digit is double the first. The third digit is the sum of the first two. The fourth digit is the difference between the third and the first. What is the password?