SOLUTION: To fill up their swimming pool, the Johnsons decided to use both their high volume hose and their neighbor's regular garden hose. If they had used only their hose, it would have t

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Question 72161: To fill up their swimming pool, the Johnsons decided to use both their high volume hose and their neighbor's regular garden hose. If they had used only their hose, it would have taken them 12 hours to fill the pool, but using both hoses it took them only 7 hours. How long would it have taken them to fill the pool using only their neighbor's hose?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
This is a comboned rate problem
The rate with their own hose is:
one pool filled / 12 hrs
The comboined rate is:
one pool filled / 7 hrs
The rate with the neighbor's hose is
one pool filled / x hrs
The equation is
1%2F12+%2B+1%2Fx+=+1%2F7
multiply both sides by 12*7*x
7x+%2B++12%2A7+=+12x
5x+=+84
x+=+16.8hrs with neighbors hose