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The Foster family and the Robinson family each used their sprinklers last summer. The water output rate for the Foster family's sprinkler was 25 L

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The Foster family and the Robinson family each used their sprinklers last summer. The water output rate for the Foster family's sprinkler was 25 L per hour. The water output rate for the Robinson family's sprinkler was 40 L per hour. The families used their sprinklers for a combined total of 50 hours, resulting in a total water output of 1475 L. How long was each sprinkler used?

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