MathDB
Mind-changing Henry

Source: 2019 AMC 10B #18

February 14, 2019
AMCAMC 10AMC 10 B

Problem Statement

Henry decides one morning to do a workout, and he walks 34\tfrac{3}{4} of the way from his home to his gym. The gym is 22 kilometers away from Henry's home. At that point, he changes his mind and walks 34\tfrac{3}{4} of the way from where he is back toward home. When he reaches that point, he changes his mind again and walks 34\tfrac{3}{4} of the distance from there back toward the gym. If Henry keeps changing his mind when he has walked 34\tfrac{3}{4} of the distance toward either the gym or home from the point where he last changed his mind, he will get very close to walking back and forth between a point AA kilometers from home and a point BB kilometers from home. What is AB|A-B|?
<spanclass=latexbold>(A)</span>23<spanclass=latexbold>(B)</span>1<spanclass=latexbold>(C)</span>115<spanclass=latexbold>(D)</span>114<spanclass=latexbold>(E)</span>112<span class='latex-bold'>(A) </span> \frac{2}{3} \qquad <span class='latex-bold'>(B) </span> 1 \qquad <span class='latex-bold'>(C) </span> 1\frac{1}{5} \qquad <span class='latex-bold'>(D) </span> 1\frac{1}{4} \qquad <span class='latex-bold'>(E) </span> 1\frac{1}{2}