Question

Walter 早上 $6:30$ 起床， $7:30$ 赶上校车，有 $6$ 节课，每节 $50$ 分钟，有 $30$ 分钟午餐时间，并且在学校还有额外 $2$ 小时时间。他乘校车回家，下午 $4:00$ 到家。他在校车上花了多少分钟？

Walter gets up at $6:30$ a.m., catches the school bus at $7:30$ a.m., has $6$ classes that last $50$ minutes each, has $30$ minutes for lunch, and has $2$ hours additional time at school. He takes the bus home and arrives at $4:00$ p.m. How many minutes has he spent on the bus?

$30$

$60$

$75$

$90$

$120$

答案：B

知识点：日期与时间单位换算

难度评级：930

解答：

从 Walter 上校车到回到家之间经过 $8.5$ 小时。

换算成分钟，共有分钟。 $60 \cdot 8.5 = 510$

他在学校的总时间是分钟。 $6 \cdot 50 + 30 + 2 \cdot 60 =$ $300 + 30 + 120 = 450$

因此他在校车上的时间是分钟。 $510 - 450 = 60$

所以正确答案是 B。

There are $8.5$ hours between the time Walter catches the school bus and arrives at home.

This is a total of $60 \cdot 8.5 = 510$ minutes.

The total time Walter spends at school is $6 \cdot 50 + 30 + 2 \cdot 60 =$ $300 + 30 + 120 = 450$ minutes.

This means that Walter spends $510 - 450 = 60$ minutes on the bus.

Thus, B is the correct answer.

1997 AMC 8 第 8 题

答案：B

难度评级：930

解答：

其他年份的第 8 题