Question

Casey 开车旅行了 $100$ 英里，途中只停下来吃了一次午饭。整趟旅行总共用了 $3$ 小时，开车时的平均速度是每小时 $40$ 英里。她的午饭休息用了多少分钟？

Casey went on a road trip that covered $100$ miles, stopping only for a lunch break along the way. The trip took $3$ hours in total and her average speed while driving was $40$ miles per hour. In minutes, how long was the lunch break?

$15$

$30$

$40$

$45$

$60$

答案：B

知识点：路程、速度与时间

难度评级：870

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文字解答：

以每小时 $40$ 英里行驶 $100$ 英里，需要 $100/40=2.5$ 小时。整趟旅行用了 $3$ 小时，所以午饭休息用了 $0.5$ 小时，也就是 $30$ 分钟。

Driving $100$ miles at $40$ miles per hour takes $100/40=2.5$ hours. The whole trip took $3$ hours, so the lunch break lasted $0.5$ hours, which is $30$ minutes.

2026 AMC 8 第 5 题

答案：B

难度评级：870

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文字解答：

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