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Mathematics 8 Online
OpenStudy (anonymous):

The Bryant family and the Martin family each used their sprinklers last summer. The water output rate for the Bryant family's sprinkler was 35L per hour. The water output rate for the Martin family's sprinkler was 25L per hour. The families used their sprinklers for a combined total of 50 hours, resulting in a total water output of 1400L . How long was each sprinkler used?

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