There are two trains, the lengths of which are 125 meters and 115 meters respectively, and the speeds are 22 m/s and 18 m/s respectively, and the two trains are traveling in opposite directions.
有两辆火车，车长分别是125米和115米，车速分别是22米/秒和18米/秒，两车相向行驶，从两车车头相遇到车尾分开需要多少秒．
<gadget id="calculator">125 + 115</gadget>
<output>240</output>

<gadget id="calculator">22 + 18</gadget>
<output>40</output>

<gadget id="calculator">240 / 40</gadget>
<output>6</output>

<result>6</result>