AMC8 2022
AMC8 2022 · Q10
AMC8 2022 · Q10. It mainly tests Rates (speed), Transformations.
One sunny day, Ling decided to take a hike in the mountains. She left her house at $8 \, \textsc{am}$, drove at a constant speed of $45$ miles per hour, and arrived at the hiking trail at $10 \, \textsc{am}$. After hiking for $3$ hours, Ling drove home at a constant speed of $60$ miles per hour. Which of the following graphs best illustrates the distance between Ling’s car and her house over the course of her trip?
在一个晴朗的日子，Ling决定去山里徒步。她早上$8 \, \textsc{am}$离开家，以每小时$45$英里的恒定速度开车，$10 \, \textsc{am}$到达徒步小径。徒步$3$小时后，Ling以每小时$60$英里的恒定速度开车回家。以下哪个图最好地展示了Ling的车与她家之间的距离在她整个行程中的变化？
(A)
(B)
(C)
(D)
(E)
Answer
Correct choice: (E)
正确答案：（E）
Solution
Note that:
Therefore, the answer is $\boxed{\textbf{(E)}}.$
注意：
因此，答案是$\boxed{\textbf{(E)}}$。
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