Two​ neighbors, Wilma and​ Betty, each have a swimming pool. Both​ Wilma's and​ Betty's pools hold 9000 gallons of water. If​ Wilma's garden hose fills at a rate of 650 gallons per hour while​ Betty's garden hose fills at a rate of 500 gallons per​ hour, how much longer does it take Betty to fill her pool than​ Wilma?

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