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On a 12-hour clock, an elapsed time of four hours looks the same as an elapsed time of 16 hours. Because of this, we can say that four hours is "clock equivalent'' to its square number of hours. What is the least whole number of hours that is greater than 4 hours and is "clock equivalent'' to its square number of hours?

 Mar 25, 2021
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The answer is 12 hours.

 Apr 11, 2021

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