Recently i have attainded infosys campus interview, after written in HR round interviwer asked 2 puzzles from me i tried but could not solved, i m waiting for result .following are puzzles given to me:

(1) Hr gave me 2 plastics block and told to make piramid using them , i tried but i couldn't made........

(2) gave me a problem , a man is in an island , he dont know swimming , deep water is around the island and in water there are sharks & Crocodiles so if he goes in water they will eat him, there is fire broked in island he has to save himself , he is in east end and air is flowing from west to east direction and fire will reach east end within half-an-hour ......how he will save himself?.......

i told him if he can go to west end he can save himself, becoz air is flowing from west to east, so fire will start dimming in west end....but HR was not satisfied with my answer......
so freind if u know please tell me right solution of these puzzles....and how important to give correct answer of puzzles to make through infy interview