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Mathematics 19 Online
OpenStudy (anonymous):

The Chang family and the Ross family each used their sprinklers last summer. The water output rate for the Chang family's sprinkler was 25 L per hour. The water output rate for the Ross family's sprinkler was 35 L per hour. The families used their sprinklers for a combined total of hours, resulting in a total water output of 1025 L . How long was each sprinkler used?

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