An expedition to explore the Lurgi desert is about to set off. It consists of four men and each one has enough food to last him five days. After some distance, one man gets sick and has to turn back. He takes with him just enough food to last him till he gets back to base. Then the second man does the same, and the third. How many day’s journey was the last man able to make into the desert and get back safely? (You must assume that the men only travel in units of one day and that they can give food to the others.)
Again, in order to make it more interesting, I am not giving the answer or the clue straight. Please try to give your answer in the comment box at my blog or by yahoo groups email, I’ll check it out as soon as possible, and I’ll give the clue and the answer eventually. Thx guys!!