Puzzles

No. 16
We tie the rope to the upper tree. We slide down to the lower one. There, we cut the rope (25 meters left) and tie the end. Then, we act according to an interesting scheme: (2 options for different trees)
1. If there are branches on the tree trunk, we slide down 1-2 meters, stick a knife in there, tie the rope, and climb to the upper edge to untie it and jump (1-2 meters isn't that much, we won't fall). And so on, down to the bottom;
2. If there are no branches on the tree trunk, that's great. We take the rope and tie it to ourselves in such a way that we are tied to the tree, but there is 10 centimeters between the tree and us. Then, we act accordingly.