passenger car and a freight train leave at the same time from two places 750 kilometers apart. The passenger car travels 80 kilometers per hour, and the freight train travels 70 kilometers per hour. After how many hours do the two cars meet?
一列客车和一列货车从相距750千米的两地同时相对开除，客车每小时行80千米，货车每小时行70千米，经过几小时两车相遇？
<gadget id="calculator">80 + 70</gadget>
<output>150</output>

<gadget id="calculator">750 / 150</gadget>
<output>5</output>

<result>5</result>