The sanchez family and the jenkins family each used their sprinklers last summer. the water output rate for the sanchez family's sprinkler was 15 l per hour. the water output rate for the jenkins family's sprinkler was 35 l per hour. the families used their sprinklers for a combined total of 45 hours, resulting in a total water output of 1075 l. how long was each sprinkler used?
sanchez family:
jenkins family: