Ononot — Two pipes fill a tank. Pipe A takes x hours, Pipe B takes y

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Central Tendencyhard

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Two pipes fill a tank. Pipe A takes $x$ hours, Pipe B takes $y$ hours. The harmonic mean of $x$ and $y$ is $4$ hours. If the tank is filled in $3$ hours when both pipes work together, what is the value of $x+y$ ?