Having spent years in the military, Calvin uses a 24 hour clock, which tells time as HH:MM. How many times a day are all of the digits in the clock even?

Details and assumptions
In the 24-hour time notation, the day begins at midnight, 00:00, and the last minute of the day begins at 23:59.

Question

Having spent years in the military, Calvin uses a 24 hour clock, which tells time as HH:MM. How many times a day are all of the digits in the clock even?

Details and assumptions
In the 24-hour time notation, the day begins at midnight, 00:00, and the last minute of the day begins at 23:59.

anonymous · Answer

possible hours

0, 2, 4,6,8,20,22

anonymous · Answer

possible minutes

00,02,04,06,08,20,22,24,26,28,40,42,44,46,48