On Friday I posted this puzzle….
Imagine a water-cask and three different sized water-taps. The smallest tap can fill the water-cask in 20 minutes. The middle tap can fill the cask in 12 minutes. And the largest tap can fill the water-cask in 5 minutes. How long does it take to fill the water-cask with the three taps together?
If you have not tried to solve it, have a go now. For everyone else the answer is after the break.
The smallest tap fills a twentieth of the water-cask in 1 minute. The middle tap fills a twelfth of water-cask in 1 minute. The largest tap fills a fifth of water-cask in 1 minute. Therefore, together they fill a third of the water-cask in 1 minute and so the water-cask is filled in 3 minutes.
Did you solve it?
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED
and is available for the Kindle
and USA here
) and on the iBookstore
in the USA here
). You can try 101 of the puzzles for free here