SOLUTION: The Jenkins family and the Green family each used their sprinklers last summer. The water output rate for the Jenkins family's sprinkler was 40L per hour. The water output rate

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Question 1038040: The Jenkins family and the Green family each used their sprinklers last summer. The water output rate for the Jenkins family's sprinkler was
40L
per hour. The water output rate for the Green family's sprinkler was
15L
per hour. The families used their sprinklers for a combined total of
55
hours, resulting in a total water output of
1575L
. How long was each sprinkler used?
Found 2 solutions by jorel555, josgarithmetic:
Answer by jorel555(1290) About Me  (Show Source):
You can put this solution on YOUR website!
Let the time used by the Jenkins be t. Then:
40(t)+15(55-t)=1575
40t+825-15t=1575
25t=750
t=30
The Jenkins used their sprinklers for 30 hours, the Green's for 25!!!!!!!!!!!!!!

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
VOLUME%2FTIME=RATE
Uniform Rates situation for volume and time.
RT=V

This works just like work rates and travel rates. The same thing. 
              RATE          TIME        VOLUME
Jenkings      40             x            40x
Green         15             y            15y
TOTALS                       55           1575