Ononot — Two pipes, A and B, fill a pool. Pipe A takes x hours and Pi

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Central Tendencyhard

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Two pipes, A and B, fill a pool. Pipe A takes $x$ hours and Pipe B takes $y$ hours. The harmonic mean of $x$ and $y$ is $4$ hours. If the pool is filled in $3$ hours when both pipes run together, what are the values of $x$ and $y$ ?