2018 AMC 8 第 6 题
先试着解答 2018 AMC 8 第 6 题，然后核对你的答案与视频与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2018 AMC 8 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
6.
Anh 去海滩旅行时，在高速公路上行驶了 英里，在海边通道上行驶了 英里。他在高速公路上的速度是海边通道上的三倍。如果 Anh 在海边通道上开了 分钟，那么他的整趟行程用了多少分钟？
On a trip to the beach, Anh traveled miles on the highway and miles on a coastal access road. He drove three times as fast on the highway as on the coastal road. If Anh spent minutes driving on the coastal road, how many minutes did his entire trip take?
小提示：
用海边通道的距离和时间先求出海边通道上的速度
Use the coastal-road information to find Anh’s coastal-road speed.
大提示：
高速公路上的速度是海边通道上速度的三倍，再由高速公路上的 英里求出所用时间
The highway speed is three times the coastal-road speed, so the highway time follows from the highway miles.
视频讲解：
Click to load, then click again to play
文字解答：
Anh 在海边通道上开了 英里，用了 分钟。因此海边通道速度（记为 ）是 也就是每分钟 英里。因为他在高速公路上的速度是 倍，也就是 ，所以高速公路速度为 英里每分钟。他在海边通道上开了 分钟，在高速公路上开了 英里，速度为每分钟 英里，所以这 英里需要 分钟。
因此总行程时间为 分钟。
所以正确答案是 C。
Anh drove miles on the coastal road in minutes. Therefore, his speed on the coastal road (notated as ) is This is mile per minute. Since he drives times as fast on the highway (i.e. ), his highway speed is mile per minute. Armed with these two facts, we know that Anh drove for minutes on the coastal road, and he drove miles at mile per minute. This means it takes minutes to drive the miles on the highway.
As such, the total travel time is minutes.
Thus, the correct answer is C.
其他年份的第 6 题
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1992 AMC 8
- 1993 AMC 8
- 1994 AMC 8
- 1995 AMC 8
- 1996 AMC 8
- 1997 AMC 8
- 1998 AMC 8
- 1999 AMC 8
- 2000 AMC 8
- 2001 AMC 8
- 2002 AMC 8
- 2003 AMC 8
- 2004 AMC 8
- 2005 AMC 8
- 2006 AMC 8
- 2007 AMC 8
- 2008 AMC 8
- 2009 AMC 8
- 2010 AMC 8
- 2011 AMC 8
- 2012 AMC 8
- 2013 AMC 8
- 2014 AMC 8
- 2015 AMC 8
- 2016 AMC 8
- 2017 AMC 8
- 2019 AMC 8
- 2020 AMC 8
- 2022 AMC 8
- 2023 AMC 8
- 2024 AMC 8
- 2025 AMC 8
- 2026 AMC 8