You can put this solution on YOUR website! .
At what time(s) after 3 pm will the minute hand and the hour hand be at right angles?
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See the lesson Clock problems in this site, where you will find all details about solution of such problems.
See especially Problem 5 of that lesson, where the same problem was solved for "2 pm".
Read it attentively and then solve your problem by substituting (plugging in) your data.
