Question

第 $14, 15,$ 和 $16$ 题涉及 Reed 老师的英语作业。

一本小说作业

Reed 老师英语课上的学生都在读同一本 $760$ 页的小说。Alice、Bob 和 Chandra 是班上的三个朋友。Alice 读一页需要 $20$ 秒，Bob 读一页需要 $45$ 秒，Chandra 读一页需要 $30$ 秒。

如果 Bob 和 Chandra 都读完整本书，Bob 会比 Chandra 多花多少秒阅读？

Problems $14, 15,$ and $16$ involve Mrs. Reed’s English assignment.

A Novel Assignment

The students in Mrs. Reed’s English class are reading the same $760$ -page novel. Three friends, Alice, Bob and Chandra, are in the class. Alice reads a page in $20$ seconds, Bob reads a page in $45$ seconds and Chandra reads a page in $30$ seconds.

If Bob and Chandra both read the whole book, Bob will spend how many more seconds reading than Chandra?

$7,600$

$11,400$

$12,500$

$15,200$

$22,800$

答案：B

知识点：速率分配律

难度评级：980

解答：

Bob 读完整本书需要 $760 \cdot 45$ 秒，Chandra 需要 $760 \cdot 30$ 秒。

两人阅读时间相差 $760 \cdot 45 - 760 \cdot 30$ $= 760(45 - 30)$ $= 760 \cdot 15$ $= 11,400$ 秒。

所以正确答案是 B。

Bob will take $760 \cdot 45$ seconds to read the book, and Chandra will take $760 \cdot 30$ seconds.

The difference between the time they spent reading is $760 \cdot 45 - 760 \cdot 30$ $= 760(45 - 30)$ $= 760 \cdot 15$ $= 11,400$ seconds.

Thus, B is the correct answer.

2006 AMC 8 第 14 题

答案：B

难度评级：980

解答：

其他年份的第 14 题