The outer radius of a bicycle wheel is 25 cm. If it rolls 200 times per minute, how many meters can it travel in 10 minutes?
一辆自行车车轮的外半径是25厘米，如果每分钟滚动200周，10分钟能前进多少米．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 * 3.14 * 25 * 200 * (1/10)</gadget>
<output>3_140</output>

<result>3_140</result>