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two pipes together can fill a tank in 12 hours alone the smaller pipe can take 7 hours longer than the larger pipe takes to fill the tank how long does it take the smaller pipe alone to fill the tank
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two pipes together can fill a tank in 12 hours alone the smaller pipe can take 7 hours longer than the larger pipe takes to fill the tank how long does it take the smaller pipe alone to fill the tank

User Iwat
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Well you should just have to add 7 to 12.

User Kratz
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