SOLUTION: One hose can fill a goldfish pond in 45 minutes. Using two different hoses together, the same pond can be filled in 20 minutes. How long would it take to fill the pond using only

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Question 200414: One hose can fill a goldfish pond in 45 minutes. Using two different hoses together, the same pond can be filled in 20 minutes. How long would it take to fill the pond using only the second hose?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
One hose can do 1%2F45 per minute.
Both together can do 1%2F20 per minute
Let x be the time for the second hose. Then that hose can do 1%2Fx per minute
1%2F45+%2B+1%2Fx+=+1%2F20
%28x+%2B+45%29%2F45x+=+1%2F20
20%28x%2B45%29+=+45x
20x+%2B+900+=+45x
900+=+25x
36+=+x
36 minutes