The lighthouse flashes their lights after every 20 seconds and 30 seconds. If they
flashed together at 7p.m, when will they flash together again?
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A clock is a device used to measure, keep, and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units: the day, the lunar month, and the year. ... Water clocks, along with the sundials, are possibly the oldest time-measuring instruments.
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If the two lighthouses INITIALLY flash at the same time, yes, they will flash together again after 60 seconds; however, if they flash any time OTHER than 20, 30, 40, or 60 seconds apart, they will never flash together.
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