Hard With A Jug
the film ‘Die Hard With A Vengeance’, John McClane (Bruce Willis) is set a
series of tricky puzzles that he must solve, under time-pressure, in order to
prevent bombs blowing up schools – and the like. The problem below is one of
those he must solve. Leaving aside your feelings of sympathy for the school
bomber, can you solve this puzzle in under 4 minutes ?!
You are given two irregular jugs – with capacity 3 litres and 5 litres, but with no further markings on them to help you measure. You have an unlimited amount of water in the public fountain.
By a series of fillings and transfers between the two jugs, you must end up with a volume of exactly 4 litres in the (larger !) jug. This is then placed on the ultra-sensitive balance, and the bomb is deactivated – or not …!
Good luck, McClane.
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