You’re in a dark room. The only light comes from an old LED digital alarm clock with four seven-segment displays. The time is displayed in 24-hour format, HH:MM (no seconds), and the leading digit is blank if not used. How much time passes between the room’s darkest state and its lightest?
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18 hours 57 minutes (1:11 to 20:08).
(Thanks, Nick.)
07/16/2021 UPDATE: Properly speaking the interval is one minute less than that, because it extends from the last moment of 1:11 to the first of 20:08. Also, given my wording, the answer might equally be 5 hours 3 minutes, as that’s the interval “between” 20:08 and 1:11. (Thanks, Michael and Joe.)
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