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The Lewis family and the Patterson family each used their sprinklers last summer. The water output rate for the Lewis family's sprinkler was 15Lper hour.

The Lewis family and the Patterson family each used their sprinklers last summer. The water output rate for the Lewis family's sprinkler was 15Lper hour. The water output rate for the Patterson family's sprinkler was 40Lper hour. The families used their sprinklers for a combined total of 65hours, resulting in a total water output of 1850L. How long was each sprinkler used?

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