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Puzzle - Hint

CalculatorMy bath has two taps and a plug hole.

The cold tap on its own fills the bath in 12 minutes, the hot one in 8 minutes.

The plug hole can drain the bath in 24 minutes with the taps off.

How long will the bath take to fill if I leave both taps on with the plug left out?

 [Ref: ZWJG] © Kevin Stone

Hint: Try seeing how many baths can be filled in 24 hours.

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[Added July 2010]

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