Solution to: Three Taps
The smallest tap fills 1⁄20 water-cask in 1 minute. The middle tap fills 1⁄12 water-cask in 1 minute. The largest tap fills 1⁄5 water-cask in 1 minute.
Together they fill 1⁄20 + 1⁄12 + 1⁄5 = 1⁄3 water-cask in 1 minute. Therefore, the whole water-cask is filled in 3 minutes.
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