It took a train 9 seconds to pass a telegraph pole with a signal light, and 35 seconds to pass a 520-meter-long iron bridge. How long is this train?
一列火车经过一根有信号灯的电线杆用了9秒，通过一座520米长的铁桥用了35秒．这列火车长多少米．
<gadget id="calculator">35 - 9</gadget>
<output>26</output>

<gadget id="calculator">520 / 26</gadget>
<output>20</output>

<gadget id="calculator">20 * 9</gadget>
<output>180</output>

<result>180</result>