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The Cooper family and...

The Cooper family and the Smith family each used their sprinklers last summer. The water output rate for the Cooper family's sprinkler was 15 L per hour. The water output rate for the Smith family's sprinkler was 30 L per hour. The families used their sprinklers for a combined total of 50 hours, resulting in a total water output of 975 L. How long was each sprinkler used? im having problems answering that question

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