It takes 23 seconds for a certain train to pass through a 342-meter tunnel, and then 17 seconds to pass through a 234-meter tunnel. This train and another train with a length of 75 meters and a speed of 24 m/s pass by the wrong train. How many seconds does it take from the front of the train to the rear of the train to leave?
某列车通过342米的隧道用23秒，接着通过234米的隧道用了17秒．这列车与另一列车长75米，速度为24米/秒的列车错车而过，从车头相遇到车尾离开共需多少秒．
<gadget id="calculator">342 - 234</gadget>
<output>108</output>

<gadget id="calculator">23 - 17</gadget>
<output>6</output>

<gadget id="calculator">108 / 6</gadget>
<output>18</output>

<gadget id="calculator">23 * 18</gadget>
<output>414</output>

<gadget id="calculator">414 - 342</gadget>
<output>72</output>

<gadget id="calculator">72 + 75</gadget>
<output>147</output>

<gadget id="calculator">18 + 24</gadget>
<output>42</output>

<gadget id="calculator">147 / 42</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>