Xiaofang is standing by the railway, and it takes 3 minutes for a train to pass her. It is known that the train is 318 meters long, and it takes 6 minutes to pass a bridge at the same speed. How long is the bridge in meters?
小芳站在铁路边，一列火车从她身边开过用了3分钟，已知这列火车长318米，以同样的速度通过一座大桥，用了6分钟．这座大桥长多少米？
<gadget id="calculator">318 / 3</gadget>
<output>106</output>

<gadget id="calculator">106 * 6</gadget>
<output>636</output>

<gadget id="calculator">636 - 318</gadget>
<output>318</output>

<result>318</result>