The Reed family and the Brown family each used their sprinklers last summer. The water output rate for the Reed family's sprinkler was 35L per hour. The water output rate for the Brown family's sprinkler was 40L per hour. The families used their sprinklers for a combined total of 50 hours, resulting in a total water output of 1925L . How long was each sprinkler used?

let reed family sprinkler used= x hr.

brown family = 50-x hr

=> 35x + 40(50-x) = 1925

=> 5x = 75

=> x = 15

reed family = 15 hr

brown family = 35 hr