The diameter of a bicycle wheel is 50 cm, and it rotates 100 times per minute. How long does it take to cross a 1570-meter road?
自行车的车轮直径是50厘米，每分钟转动100周，要过1570米的公路，需要几分钟？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * (1/2) * 100</gadget>
<output>157</output>

<gadget id="calculator">1_570 / 157</gadget>
<output>10</output>

<result>10</result>