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.

Guest Sep 19, 2021

#2**0 **

*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.*

When the clock striks the hour, then the minute hand is pointing at the 12.

The positions that the hour hand can be in to make a 90^{o} angle are at the **3** or the **9**.

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Guest Sep 19, 2021