SOLUTION: The Cooper family and the Jackson family each used their sprinklers last summer. The water output rate for the Cooper family's sprinkler was 30L per hour. The water output rate for

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Question 1004221: The Cooper family and the Jackson family each used their sprinklers last summer. The water output rate for the Cooper family's sprinkler was 30L per hour. The water output rate for the Jackson family's sprinkler was 25L per hour. The families used their sprinklers for a combined total of 50 hours, resulting in a total water output of 1425L. How long was each sprinkler used?
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
R*T=W uniform rate rule for water output W, quantity in liters

c, time for cooper's output
j, time for jackson's output 

              rate       time       volume in liters
COOPER         30        (c)         30c
JACKSON        25        (j)         25j
TOTAL                    50          1425

Solve this system for c and j.
system%28c%2Bj=50%2C30c%2B25j=1425%29