A bicycle, the outer diameter of the tire is 61 cm, if it rotates 100 times per minute, how many meters will it travel per minute?
一辆自行车，轮胎外直径是61厘米，如果每分钟转动100周，每分钟大约行多少米？
<gadget id="calculator">61 / 100</gadget>
<output>61/100 = around 0.61</output>

<gadget id="calculator">3.14 * (61/100) * 100</gadget>
<output>191.54</output>

<result>191.54</result>