It took a train 12 seconds to pass a signal light pole and 46 seconds to pass a 612-meter bridge. What is the length of this train in meters?
某列火车经过一座信号灯的电杆用了12秒钟，通过612米的大桥用了46秒，这列火车的长度是多少米．
<gadget id="calculator">46 - 12</gadget>
<output>34</output>

<gadget id="calculator">612 / 34</gadget>
<output>18</output>

<gadget id="calculator">18 * 12</gadget>
<output>216</output>

<result>216</result>