The total length of the Wuhan Bridge is 1,200 meters. It takes 75 seconds for a train to cross the bridge, and 15 seconds for the whole train to pass the electric poles beside the road. Find the total length of the train?
武汉大桥全长1200米，一列火车开过大桥需要75秒钟，全列车开过路旁的电线杆需15秒钟，求火车的全长？
<gadget id="calculator">75 - 15</gadget>
<output>60</output>

<gadget id="calculator">1_200 / 60</gadget>
<output>20</output>

<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<result>300</result>