2026 AMC 8 Problem 19

Attempt Problem 19 of the 2026 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2026 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

19.

Miguel is walking with his dog, Luna. When they reach the entrance to a park, Miguel throws a ball straight ahead and continues to walk at a steady pace. Luna sprints toward the ball, which stops by a tree. As soon as the dog reaches the ball, she brings it back to Miguel. Luna runs 55 times faster than Miguel walks. What fraction of the distance between the entrance and the tree does Miguel cover by the time Luna brings him the ball?
16\dfrac{1}{6}
15\dfrac{1}{5}
14\dfrac{1}{4}
13\dfrac{1}{3}
25\dfrac{2}{5}
Answer: D
Concepts:distance rate and timeratio and proportion
Small hint:
Let the entrance-to-tree distance be DD
Big hint:
After Luna reaches the tree, Miguel and Luna move toward each other
Video solution:
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Written solution:
Let the entrance-to-tree distance be DD, and let Miguel’s speed be 11. Luna’s speed is 55. Luna reaches the tree in time D5\frac{D}{5}, during which Miguel walks D5\frac{D}{5}. The remaining distance between Luna and Miguel is 4D5\frac{4D}{5}, and they close it at combined speed 66, taking time 2D15\frac{2D}{15}. Miguel walks a total distance D5+2D15=D3\frac{D}{5}+\frac{2D}{15}=\frac{D}{3}, which is 13\frac{1}{3} of the entrance-to-tree distance.
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