The lights
A tower has 2 lights the Green light and the Red light. The Green light is emitted after every 12 seconds while the Red light is emitted every 15 seconds. Suppose that the light emission time is negligible. At midnight both Green and Red are emitted at the same time. After how many seconds they will be both emitted at the same time again?
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1 solution
The lowest common multiple of 12 and 15 is 60.