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Mathematics, 19.10.2021 14:00 josephfoxworth

The Hernandez family and the Campbell family each used their sprinklers last summer. The water output rate for the Hernandez family sprinkler was 30 L per hour. The water output rate for the Campbell family’s sprinkler was 40 L per hour. The families used their sprinklers for a combined total of 45 hours, resulting in a total water output of 1600 L. How long was each sprinkler used

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