27. Person A and Person B start from points A and B respectively at the same time, moving towards each other at uniform speeds. They first meet at a point 8 kilometers away from A. After meeting, they continue to move forward, reaching each other's starting points and immediately turning back. They meet for the second time at a point 6 kilometers away from A. The distance between A and B is ______ kilometers.
Analysis: The first time they meet, the two people together have walked one full distance AB, with person A walking 8 kilometers (since A starts from point A, and the first meeting point is 8 kilometers away from A); the second time they meet, from the start to the second meeting, the two people together have walked three full distances AB, person A has walked $8 \times 3=24$ kilometers, and the 24 kilometers that A has walked plus 6 kilometers equals two full distances AB,
so the distance between A and B is $(8 \times 3+6) \div 2=15$ (kilometers)