A railway bridge is 1800 meters long. It takes 75 seconds for a train to cross the bridge, and 15 seconds for the train to cross the electric pole beside the road. What is the total length of the train in meters?
一座铁路桥长1800米，一列火车开过大桥需要75秒，火车开过路旁的电线杆只需15秒，求火车全长是多少米？
<gadget id="calculator">75 - 15</gadget>
<output>60</output>

<gadget id="calculator">1_800 / 60</gadget>
<output>30</output>

<gadget id="calculator">30 * 15</gadget>
<output>450</output>

<result>450</result>