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 Hours of Operation (Posted on 2014-11-12)
While on a walk the other day I passed an auto body shop whose hours were 9:15am - 4:30pm. Aside from the oddly specific opening hour, I noticed that, between the two times, no digits were repeated.

(a) If I assume that I'm using a 12-hour clock, and that I'm never open at midnight, what are the longest and shortest hours of operation I can have that still have no repeated digits in my two times?

(b) What if I'm using a 24-hour clock?

[NOTE: assume no leading zeros for the hour, but leading zeros in the minute in order to always have a two-digit minutes value.]

 No Solution Yet Submitted by Paul Rating: 3.0000 (1 votes)

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 Longest duration, 24 hour clock (spoiler) | Comment 3 of 8 |
I think that would be 1:46 - 23:59, which is 22 hours and 13 minutes.
 Posted by Steve Herman on 2014-11-12 15:25:53

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