The outer radius of a large truck wheel is 1 meter, and it rotates 20 times per minute. It takes 2 minutes for it to pass a bridge. How long is the bridge in meters?
一辆大型货车车轮的外半径是1米，每分钟转动20圈，它通过一座大桥需要2分钟．这座桥长多少米？
<gadget id="calculator">3.14 * 1 * 20 * 2</gadget>
<output>125.6</output>

<result>125.6</result>