The outer diameter of the bicycle wheel is about 5dm. If the wheel rotates 100 times per minute, and the distance from Xiaoqiang’s home to school is 3.14km, how long will it take Xiaoqiang to get from home to school by bicycle?
自行车车轮的外直径约为5dm，如果车轮每分钟转100圈，小强家到学校的距离是3.14km，那么小强骑车约需多长时间能从家到学校？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1_000 / 157</gadget>
<output>1_000/157 = around 6.369427</output>

<gadget id="calculator">3.14 * (1_000/157)</gadget>
<output>20</output>

<result>20</result>