It took a train 25 seconds to pass through a 350-meter-long tunnel, and 23 seconds to pass through a 310-meter-long tunnel. This train catches up with another train with a length of 120 meters, and it takes 45 seconds from the front of the train to the time when the rear of the train leaves completely. Find the speed of the other train.
一列火车通过350米长的隧道用了25秒，通过310米长的隧道用了23秒．这列火车追上另一列长120米的火车，从车头追上到车尾完全离开用了45秒．求另一列火车的速度．
<gadget id="calculator">350 - 310</gadget>
<output>40</output>

<gadget id="calculator">25 - 23</gadget>
<output>2</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 * 25</gadget>
<output>500</output>

<gadget id="calculator">500 - 350</gadget>
<output>150</output>

<gadget id="calculator">150 + 120</gadget>
<output>270</output>

<gadget id="calculator">270 / 45</gadget>
<output>6</output>

<gadget id="calculator">20 - 6</gadget>
<output>14</output>

<result>14</result>