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Puzzle - Hint

PipesA large fresh water reservoir has two types of drainage system. Small pipes and large pipes.

6 large pipes, on their own, can drain the reservoir in 12 hours.

6 small pipes, on their own, can drain the reservoir in 18 hours.

How long will 6 large pipes and 6 small pipes take to drain the reservoir?

 [Ref: ZNEC] © Kevin Stone

Hint: It doesn't matter how large the pipes are .

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[Added July 2010]

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