A puzzle

A quick puzzle for you. It'll be relatively easy if you've seen Die Hard 3 :)

You have an unlimited supply of water. you've a 5-litre jerrycan and a 3-litre jerrycan. You've to get 4 litres exactly. How?
You're allowed to dump water, whatever you want, so long as you get 4 litres.

Someone answer in the comments for everyone else!

Comments

  1. The best way to waste time in work!! :)

    So fill the 5-litre jerrycan, fill the 3-litre jerrycan from the water in the 5-litre jerrycan, which will leave 2 litres in the 5-litre jerrycan.

    Now empty the 3-litre jerrycan and pour the 2 litres thats in the 5-litre jerrycan into the 3-litre jerrycan.

    Re fill the 5-litre jerrycan and using this water fill the 3-litre jerrycan (2 litres already in there so you'll use one litre from the 5-litre jerrycan to fill it), this will leave 4 litres in the 5-litre jerrycan

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  2. Git! beat me by 3 mins!!!

    Fill the 5 – pour it into the 3, leaving 2 in the 5.
    Empty the 3.
    Pour the 2 from the 5 into the now empty 3 leaving 1 empty.
    Fill the 5 again and pour 1 from the full 5 into the two-thirds full 3 leaving 4 in the 5!

    Great to read signs of life from you guys!

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