A pool has three water faucet and one drain faucet. The first water faucet can fill up
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A pool has three water faucet and one drain faucet. The first water faucet can fill up the pool in hours, the second water faucet can fill up the pool in hours, and the third water faucet can fill up the pool in hours. However, the drain faucet can empty the pool in hours. How long will take to fill up the pool if the three faucet and the drain faucet are opened at the same time?
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