解答题目---Here is the extraction of the content from the image: **Question 2** * **Question Stem:** 一辆自行车的车轮半径是 40 cm, 如果车轮每分钟转 100 转, 要通过 2512 m 的桥, 大约需要用时几分? * **Relevant Information:** * 车轮半径 (wheel radius): 40 cm * 车轮每分钟转 (wheel revolutions per minute): 100 转/分钟 * 要通过的桥长 (distance to pass): 2512 m * **Question:** Approximately how many minutes will it take? **Question 3** * **Question Stem:** 一种浇灌麦田的自动旋转喷灌装置, 它的射程是 20 m, 它喷灌的面积是多少平方米? * **Relevant Information:** * 射程 (range): 20 m * **Question:** What is the area it irrigates in square meters? **Question 4** * **Question Stem:** 一根铁丝可以围成一个半径是 3 cm 的半圆, 这根铁丝有多长? 它所围成的半圆的面积有多大? * **Relevant Information:** * 半圆半径 (semicircle radius): 3 cm * **Questions:** * What is the length of this wire? * What is the area of the semicircle it forms? **Question 5** * **Question Stem:** 用篱笆围成一块周长是 18.84 m 的圆形菜地, 这块菜地的占地面积有多大? * **Relevant Information:** * 圆形菜地周长 (circumference of circular vegetable patch): 18.84 m * **Question:** What is the area of this vegetable patch? **Question 6** * **Question Stem:** 一个圆形花坛的半径是 2 m, 如下图所示, 如果把这个圆形花坛的半径增加 1 m, 那么, 它的面积增加了多少平方米? * **Relevant Information:** * 圆形花坛初始半径 (initial radius of circular flower bed): 2 m * 半径增加 (radius increase): 1 m * **Question:** What is the increase in its area in square meters? * **Chart/Diagram Description:** * **Type:** Geometric diagram showing concentric circles. * **Main Elements:** * Two concentric circles. * A line segment from the center to the inner circle boundary is labeled "2 m", indicating the radius of the inner circle. * A line segment is shown connecting the boundaries of the inner and outer circles along a radius, labeled "1 m", indicating the increase in radius. * **Labels and Annotations:** The diagram shows the initial radius (2 m) and the amount of radius increase (1 m).