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Rajeev is trapped atop a building 200m high. He has with him a rope 150m long. There is a hook at the top where he stands. Looking down, he notices that midway between him and the ground, at a height of 100m, there is a ledge with another hook. In his pocket lies a Swiss knife. Hmm... how might he be able to come down using the rope, the two hooks, and the Swiss knife?Â
Explanation :
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Cut rope into 50m and 100m pieces. Tie one end of the 50m piece to the
top hook and make a knot at the other end (see picture for a bowline
knot) with a fixed loop. Pass the 100m piece through the loop and tie
its two ends to form a loop. Now, Rajeev can climb down 100m to the
ledge. Now, cut the 100m loop using the knife. Collect this piece by
holding one end, pulling at it and letting the other end slide through
the loop. Finally, tie one end of this 100m piece to the hook at the
ledge and slide down.
Cut the rope into a large 100m piece and a small 50m piece.
tie the small rope to the hook and create a bow-line hitch at the loose end of the small piece.
thread the 100m piece through the loop so that the midpoint is at the loop and hangs down by 50m on each end.
twist the two ends around each other like a candle wick and descend to the ledge.
untwist the two ends and pull the 100m rope out from the loop. the rest should be easy.
