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Krystal's swimming pool can hold up to 21,600 gallons of water. She turns on a hose that pours 1,200 gallons per hour into the pool.

Krystal's swimming pool can hold up to 21,600 gallons of water. She turns on a hose that pours 1,200 gallons per hour into the pool. If the pool already has 4,800 gallons in it, then how many more hours will it take to fill up the pool?

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