When Kobayashi was going to school, he saw a train coming from the opposite side. At this time, he measured with his watch that it took 12 seconds for the train to pass by him, and then he measured that it took 45 seconds for the train to pass through an 825-meter railway bridge. bell. So what is the length of the train in meters?
小林上学时，看见有一列火车从对面开来，这时他用手表测出这列火车通过自己身边用了12秒钟，随后又测出这列火车通过一座825米的铁路桥用了45秒钟．那么这列火车的长度是多少米．
<gadget id="calculator">45 - 12</gadget>
<output>33</output>

<gadget id="calculator">825 / 33</gadget>
<output>25</output>

<gadget id="calculator">25 * 12</gadget>
<output>300</output>

<result>300</result>