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Mathematics, 13.02.2020 17:47 etzzz32561

There are 3 lighthouses along a strip of the coast. Lighthouse A shines its light on for 3 seconds and then off for 3 seconds. Lighthouse B shines its light on for 4 seconds and then off for 4 seconds. Lighthouse C shines its light on for 5 seconds and then off for 5 seconds. If all 3 lighthouses start shining their lights on at the same time when will be the next time all three lighthouses will shine their lights on at the same time?

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