SOLUTION: The Martinez family and the Hughes family each used their sprinklers last summer. The water output rate for the Martinez family was 20l per hour. The water output for the Hughes fa

Question 820068: The Martinez family and the Hughes family each used their sprinklers last summer. The water output rate for the Martinez family was 20l per hour. The water output for the Hughes family was 40l per hour. The families used their sprinklers for a combined total of 65 hours, resulting in a total water output of 1800L. How long was each sprinkler used?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
m+h=65,
20m+40h=1800
h = 25, m = 40
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