Problem 2 · 2023 Math Kangaroo
Medium
Logic & Word Problems
spatial-reasoning
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Answer: D
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Hint 1 of 2
Match each phase of the trip to a speed: running is fast, the train is faster still, walking is slow.
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Hint 2 of 2
The underground ride has two stops, so its speed graph dips to zero twice in the middle.
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Approach: match the story phases to the speed-time graph
- First she runs: a moderate speed bump at the start.
- Then the train: a high, flat speed that drops to zero twice (two stops) before reaching her stop.
- Finally she walks: a low, flat speed to the end.
- Only graph D shows run, then a fast train with two zero-speed stops, then a slow walk.
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