Mathematics, 15.04.2021 14:00 smusisca53

A red light flashes every 3 seconds. A yellow light flashes every 12 seconds. A green light flashes every 15 seconds They all flash at the same time. After how many seconds will they next all flash at the same time?

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A red light flashes every 3 seconds. A yellow light flashes every 12 seconds. A green light flashes...