Three bells ring at the same time. After that, the first rings every three hours, the second bell rings every 4 hours, and the third bell rings every 5 hours. After how many hours will they ring together?

Three bells ring at the same time.

After that, the first rings every three
hours, the second bell rings every 4
hours, and the third bell rings every 5
hours. After how many hours will
they ring together?

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