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8:30 AM. The bell rings at 8, at 8:10, 8:20, and 8:30. The buzzer goes off at 8, 8:15 and 8:30.

And at about 8:45, I'm going to silence one or both of them by unplugging them....

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Q: A bell rings every 10 minutes and a buzzer sounds every 15 minutes if the bell and buzzer both sound at 8 am what is the next time that they will both go off at the same time?
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