The diameter of a bicycle wheel is 60cm. When riding a bicycle, the wheel rotates 40 times per minute. How many minutes does it take to walk across a 37,680-meter bridge?
一个自行车轮的直径是60cm，骑车时车轮每分钟转40周，走过37680米的大桥，需要多少分钟？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3.14 * (3/5) * 40</gadget>
<output>75.36</output>

<gadget id="calculator">37_680 / 75.36</gadget>
<output>500</output>

<result>500</result>