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Find all integers n such that when the clock strikes n o'clock, the acute angle between the hour and minute hands is 90 degrees. Enter your answer as a comma-separated list.

 Jul 31, 2021
 #1
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3 and 9 o'clock

 Jul 31, 2021
 #2
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Are these questions in a book or something?  I answered this question

two months ago at https://web2.0calc.com/questions/geometry_68515

 Jul 31, 2021

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