A train is 640 meters long. It takes 16 seconds to pass a tree on the side of the road, and it takes 58 seconds to pass a bridge at the same speed. How long is the bridge?
一列火车长640米，从路边的一棵树经过用了16秒，以同样的速度经过一座大桥，从车头上桥到车尾离桥共用了58秒，求这座大桥长多少米？
<gadget id="calculator">640 / 16</gadget>
<output>40</output>

<gadget id="calculator">40 * 58</gadget>
<output>2_320</output>

<gadget id="calculator">2_320 - 640</gadget>
<output>1_680</output>

<result>1_680</result>