The diameter of a bicycle is 0.4 meters. If Xiao Ming rides the bicycle across a bridge at a speed of 100 laps per minute and it takes 3 minutes, how long is the bridge?
一辆自行车的直径是0.4米，如果小明骑着这辆自行车以每分钟100圈的速度经过一座桥，一共用了3分钟，那么这座桥有多长？
<gadget id="calculator">3.14 * 0.4 * 100 * 3</gadget>
<output>376.8</output>

<result>376.8</result>