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OpenStudy (anonymous):
The Chang family and the Brown family each used their sprinklers last summer. The water output rate for the Chang family's sprinkler was 40 L per hour. The water output rate for the Brown family's sprinkler was 25 L per hour. The families used their sprinklers for a combined total of 60 hours, resulting in a total water output of 1800 L . How long was each sprinkler used?
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