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Question 927090: 4 pipes take 70 minutes to fill a tank. how long will it take for 7 pipes to fill the tank?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! r = w/pt
1/(4*70) = 1/(7*t)
1/280 = 1/7t
t = (1/7)/(1/280)
t = 40 minutes
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