A bicycle with a wheel radius of 40cm wants to pass a 301.44m bridge, and the wheels rotate 30 times per minute. How many minutes can this bicycle pass the bridge?
一辆自行车的车轮半径为40cm，要通过一条301.44m的大桥，车轮每分钟转动30圈，这辆自行车几分钟可以通过此大桥？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3.14 * 40 * 2 * (3/10)</gadget>
<output>75.36</output>

<gadget id="calculator">301.44 / 75.36</gadget>
<output>4</output>

<result>4</result>