Two trains depart from two places 693 kilometers apart at the same time, the passenger train travels 70 kilometers per hour, and the freight train travels 56 kilometers per hour. How many hours later did the two cars meet?
两列火车从相距693千米的两地同时相对开出，客车每小时行70千米，货车每小时行56千米．两车开出几小时后相遇？
<gadget id="calculator">70 + 56</gadget>
<output>126</output>

<gadget id="calculator">693 / 126</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>