One car travels 38 km/h and the other travels 42 km/h. These two cars depart from two stations 400 kilometers apart at the same time. How many hours have passed before the two cars meet on the way?
一辆汽车每小时行驶38千米，另一辆汽车每小时行驶42千米．这两辆汽车同时从相距400千米的两个车站相对开出，经过多少小时两车在途中相遇？
<gadget id="calculator">38 + 42</gadget>
<output>80</output>

<gadget id="calculator">400 / 80</gadget>
<output>5</output>

<result>5</result>