The Long family and the Chang family each used their sprinklers last summer. The water output rate for the Long family's sprinkler was 30L per hour. The water output rate for the Chang family's sprinkler was 25L per hour. The families used their sprinklers for a combined total of 60 hours, resulting in a total water output of 1675L. How long was each sprinkler used?  Long family's sprinkler:____hours Chang family's sprinkler:_____hours

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