Pump 1 can empty a pool in 9 hours while Pump 2 can empty the same pool in 12 hours. If the two pumps worked together, how long would it take them to empty the pool?

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Solve the following inequality: 2x + 6 ≤ 5x - 9

Pump 1 does 1/9 per hour and Pump 2 does 1/12 per hour

how many hours then together?

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