The outer diameter of a bicycle wheel is about 70cm. If it turns 40 times per minute on average, how many minutes will it take to pass a 219.8m long bridge?
一辆自行车轮子的外直径大约是70cm，如果它平均每分钟转40周，通过一座长219.8m的大桥，需要几分钟？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.14 * 70 * (2/5)</gadget>
<output>87.92</output>

<gadget id="calculator">219.8 / 87.92</gadget>
<output>2.5</output>

<result>2.5</result>