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A Clockwork O'Range (Posted on 2007-11-16) Difficulty: 3 of 5

Sometime last year, while sitting at my desk, my spouse took a photograph of me. You could figure the date and time the photo was taken because sitting beside me was my digital clock displaying the current time and date (at the time) in the format [hh:mm:ss | MM/DD].
I noticed later that the time and date displayed was the mid-point between the earliest date-time that could be displayed on my clock using only the digits 0-9 once each and the latest date-time with the same constraint.

In the photograph, what time did my clock display?

(Assume, for the problem, that the year in question is neither a leap year nor does the region observe Daylight Savings.)

  Submitted by Dej Mar    
Rating: 2.0000 (1 votes)
Solution: (Hide)
The time displayed was [17:52:51 | 06/27].

The earliest time that could be displayed using only the digits 0-9 each once is:
[17:48:59 | 03/26]
The latest time that could be displayed using only the digits 0-9 each once is:
[17:56:43 | 09/28]

September 28 occurs 186 days after March 26, therefore the day that is the mid-point between the two dates is 93 days after March 26 and 93 days before September 28. This date is June 27 [06/27].
17:56:43 occurs 464 seconds after 17:48:59, therefore the time that is the mid-point between the two times is 232 seconds after 17:48:59 and 232 seconds before 17:56:43. This time is 17:52:51.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
AnswerK Sengupta2008-12-21 02:49:28
re: Is there more than one possibility? (spoiler)Dej Mar2007-11-16 11:05:19
SolutionIs there more than one possibility? (spoiler)Charlie2007-11-16 10:41:44
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