Hands on a Clock

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Hi guys, I'm back with a quick(or not so quick) math problem for you to solve. Remember, please try and solve it yourself, rather than waiting for me to post the answer. Anyway, here it is.

The minute and hour hands are at angles of 180º(straight) a total of twelve times each twelve hours(approx. one per hour). What are the exact times where this occurs? Please put your answer in the comment section below and I will make sure to post the answer soon.Related image

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