SOLUTION: The Harris family and the Richardson family each used their sprinklers. The water output rate for the Harris family's sprinkler was 30L per hour. The water output rate for theRich

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Question 1119310: The Harris family and the Richardson family each used their sprinklers. The water output rate for the Harris family's sprinkler was 30L per hour. The water output rate for theRichardson family's sprinkler was 40L per hour. The families used their sprinklers for a combined total of 55 hours, resulting in a total water output of
2000L. How long was each sprinkler used?
Harris family:
Richardson family:
Answer by solver91311(24713) About Me  (Show Source):
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Let represent the number of hours for the 40L family. Then the 30L family used their sprinkler for hours. The 40L family then used liters, and the other family used liters. These two amounts must sum to 2000 liters. Hence:



Solve for , then calculate


John

My calculator said it, I believe it, that settles it