On a regular 12-hour digital clock how many times would the same three digits in a row be displayed (e.g. 1:11,11:12,12:22) in one day?
18 times ( 9 * 2 )
On a 12-hour digital clock, what is the smallest interval between two times that are palindromic (can be read forwards and backwards as the same number)?
On a digital clock there are times which have the special property that the minutes digits add up to the hours digit, like 7:25 or 13:49. Which hour has the most of these times?