AMC 8 2023 Problem 9
AMC8 2023 年第 9 题
统计与数据图表★☆☆☆☆
Malaika is skiing on a mountain. The graph below shows her elevation, in meters, above the base of the mountain as she skis along a trail. In total, how many seconds does she spend at an elevation between 4 and 7 meters?
正在山上滑雪下图显示了她沿着小径滑雪时以山脚为基准的海拔高度 (单位为米)．问她在4米到7米之间的高度共停留了多少秒？
- A.6
- B.8
- C.10
- D.12
- E.14
正确答案 · Correct Answer
B
解析 · Solution
Solution 1
We mark the time intervals in which Malaika's elevation is between 4 and 7 meters in red, as shown below: The requested time intervals are: from the 2 nd to the 4 th seconds from the 6 th to the 10 th seconds from the 12 th to the 14 th seconds In total, Malaika spends (4-2) + (10-6) + (14-12) = 8 seconds at such elevation., MRENTHUSIASM
Notice that the entire section between the 2 second mark and the 14 second mark is between the 4 and 7 feet elevation level except the 2 seconds where she skis just under the 4 feet mark and when she skis just above the 7 feet mark, making the answer 14-2-2-2=8.
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