The Rogers family and the Walker family each used their sprinklers last summer. The water output rate for the Rogers family's sprinkler was 30 L per hour. The
water output rate for the Walker family's sprinkler was 20 L per hour. The families used their sprinklers for a combined total of 45 hours, resulting in a total
water output of 1150 L. How long was each sprinkler used?
Rogers family's sprinkler:
hours
Walker family's sprinkler: hours