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Puzzler loves solving puzzles at PuzzleFry.com. I am proud PuzzleFry member and like my time invested in solving brain teasers.
  • 3
    How about this.. B and C travel first 1/8th distance with A. then they pass on the fuel to A, keeping sufficient enough for B and C to travel back home. So A has its fuel share + 1/4 th from B+ 1/4 th from C. Therefore it travels half of the distance on its own fuel. then half of remaining half(1/4) using B’s fuel and then remaining 1/4 using C’s fuel.
    Answer: 3
    I find no flaw. Simple is better 🙂

    This answer accepted by SherlockHolmes. on 24th August 2015 Earned 20 points.

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  • A,B,C travel 1/8th the distance consuming 25% fo their fuel,at this point C shares 50% of its fuel with A & B, thus A & B have 100% of the fuel and C comes back with the remaining 25% fuel.
    Now A & B travel futher 1/8th of the distance, at ths point B share 25% of it’s fuel with A, thus A have 100% fule and B comes back with remaining 50%.
    Now A continues its journey and when A reaches midway, it will have 50% fo the fuel. at this point B & C will start their journey in opposite direction. when A has covered 5/8th of journey, B & C would have covered 1/4th journey from opposite side, thus C shares 25% of its fuel with B and goes back. B continues its journey towards A. when A and B meet at 3/4th of the journey, A will not have any fuel and B will have 75% fuel. At C leaves again with and B shares 25% fuel with A and B goes back to airport with remaining 50% fuel.
    When A and C meet at 7/8th of the journey C shares 25% of its fule with A.
    This way 3 planes and 5.5 tanks of fuel is needed.

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