A train takes 25 seconds to pass through a 250-meter-long tunnel, and 23 seconds to pass through a 210-meter-long tunnel. Question: How many seconds does it take for this train to pass another train with a length of 320 meters and a speed of 64.8 kilometers per hour?
某列车通过250米长的隧道用25秒，通过210米长的隧道用23秒．问：该列车与另一列长320米、时速64.8千米的列车错车而过需要多少秒．
<gadget id="calculator">250 - 210</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">25 * 20</gadget>
<output>500</output>

<gadget id="calculator">500 - 250</gadget>
<output>250</output>

<gadget id="calculator">250 + 320</gadget>
<output>570</output>

<gadget id="calculator">20 + 18</gadget>
<output>38</output>

<gadget id="calculator">570 / 38</gadget>
<output>15</output>

<result>15</result>