Two families each used their sprinklers last summer. Family #1's sprinkler was used 30 hrs. The 2nd family's sprinkler was used 20 hrs. Their was a combined total output of 1050 L of water. What was the water output for each sprinkler if the sum of the two rates was 45 L per hour?

it's ok. Our equation solved the rate of each sprinkler as well. Sprinkler of the family1 had a rate of 30L per hour while sprinkler of the family 2 did a rate of 15L per hour