The Mitchell family and the Walker family each used their sprinklers last summer. The water output rate for the
Mitchell family's sprinkler was 35L per hour. The water output rate for the Walker family's sprinkler was 20L per hour. The families used their sprinklers for a combined total of 70
hours, resulting in a total water output of 1850L. How long was each sprinkler used?
Mitchell's family sprinter:__ hours
Walker's family sprinter: __ hours