Question

在一个漆黑的暴风雨夜，史努比突然看见一道闪电。十秒后他听到雷声。声速是每秒 $1088$ 英尺，一英里是 $5280$ 英尺。估计史努比距离闪电有多远，精确到最近的半英里。

On a dark and stormy night Snoopy suddenly saw a flash of lightning. Ten seconds later he heard the sound of thunder. The speed of sound is $1088$ feet per second and one mile is $5280$ feet. Estimate, to the nearest half-mile, how far Snoopy was from the flash of lightning.

$1$

$1\frac{1}{2}$

$2$

$2\frac{1}{2}$

$3$

答案：C

知识点：路程、速度与时间估算单位换算

难度评级：730

小提示：

使用距离等于速度乘以时间

Use distance equals rate times time

大提示：

将这个距离与 $2$ 英里比较

Compare the distance with $2$ miles

解答：

在 $10$ 秒内，雷声传播了 $10 \cdot 1088 = 10880$ 英尺。

$2$ 英里约为 $2 \cdot 5280 = 10560$ 英尺，接近上面的距离。

所以正确答案是 C。

In $10$ seconds, the thunder was able to travel $10 \cdot 1088 = 10880$ feet.

Note that $2$ miles is about $2 \cdot 5280 = 10560$ feet, which is close to what we found above.

Thus, C is the correct answer.

2001 AMC 8 第 5 题

答案：C

难度评级：730

小提示：

大提示：

解答：

其他年份的第 5 题