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A light house has two lights one that flashes every 3 minutes and another that flashes every 3 and a half minute suppose the light flash together at noon what is the first time after 2 p.m. that will they will flash together again

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  1. the 1/2 minutes will add up to another 3.5 minutes after 7 3-minute cycles
    So, at 2:21 they will both blink again.

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    oobleck

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