Forgets 2612
It happens to Dorothy that when filling the bath with water, she forgets to put a plug in the drain. The bath would fill up in 20 minutes if the drain were blocked. A full tub would be emptied through the drain in 30 minutes. How long will it take Dorothy to fill the bathtub if she forgets to plug the drain?
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![](/img/12/Dorotka.jpg)
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