SOLUTION: Two pipes can be used to fill a water tank. If the first pipe is used alone it can fill the tank in 27 minutes; the second pipe alone can fill the tank in 54 minutes. A third pipe,

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Two pipes can be used to fill a water tank. If the first pipe is used alone it can fill the tank in 27 minutes; the second pipe alone can fill the tank in 54 minutes. A third pipe,      Log On

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Question 242725: Two pipes can be used to fill a water tank. If the first pipe is used alone it can fill the tank in 27 minutes; the second pipe alone can fill the tank in 54 minutes. A third pipe, connected to an outlet of the tank, can empty the tank in 36 minutes. If all pipes are open when the tank is empty, how long will it take to fill the tank?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
x/27 + x/54 - x/36 = 1

multiplying by 108 (LCD) ___ 4x + 2x - 3x = 108

3x = 108 ___ x = 36