It took a train 50 seconds to cross the 750-meter-long bridge (from the front of the train to the rear of the bridge), and it took 23 seconds to pass through the 210-meter tunnel (from the front of the train to the rear of the bridge). It is also known that there is a freight car in the same direction as the train in front of the train. The length of the freight car is 230 meters and the speed is 17 meters per second. How long does it take for the train and the wagon to depart from each other?
一列火车通过750米长的大桥用了50秒(从车头上桥到车尾离桥)，通过210米的隧道用了23秒(从车头上桥到车尾离桥)．又知该列车的前方有一辆与它行驶方向相同的货车，货车身长230米，速度为每秒17米．列车与货车从相遇到离开要用多少时间？
<gadget id="calculator">750 - 210</gadget>
<output>540</output>

<gadget id="calculator">50 - 23</gadget>
<output>27</output>

<gadget id="calculator">540 / 27</gadget>
<output>20</output>

<gadget id="calculator">20 * 50</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 750</gadget>
<output>250</output>

<gadget id="calculator">250 + 230</gadget>
<output>480</output>

<gadget id="calculator">20 - 17</gadget>
<output>3</output>

<gadget id="calculator">480 / 3</gadget>
<output>160</output>

<result>160</result>