The outer diameter of a bicycle wheel is 50cm, and the distance from Wang Yong's home to school is 1570 meters. If the wheel rotates 80 times per minute, how long will it take Wang Yong to go from home to school?
一辆自行车车轮的外直径是50cm，从王永家到学校有1570米，如果车轮每分钟转80周，王永从家到学校要多长时间？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3.14 * (1/2) * 80</gadget>
<output>125.6</output>

<gadget id="calculator">1_570 / 125.6</gadget>
<output>12.5</output>

<result>12.5</result>