The radius of a bicycle wheel is 4 decimeters, and the wheel rotates 100 times per minute. How long does it take to pass a 2512-meter-long bridge?
一辆自行车的车轮半径是4分米，车轮每分钟转100圈，要通过一座2512米长的大桥，大约需要几分钟？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">3.14 * 4 * 2 * 10</gadget>
<output>251.2</output>

<gadget id="calculator">100 / 251.2</gadget>
<output>0.398089</output>

<gadget id="calculator">3.14 * 4 * 2 * 0.398089</gadget>
<output>9.999996</output>

<result>9.999996</result>