Two cars drive towards each other from two places 1200 kilometers apart at the same time. After 8 hours, the distance between the two cars is 400 kilometers. How many hours later will the two cars meet?
两辆汽车同时从相距1200千米的两地相向开出，8小时后两车相距400千米，再经过几小时两车相遇？
<gadget id="calculator">1_200 - 400</gadget>
<output>800</output>

<gadget id="calculator">800 / 8</gadget>
<output>100</output>

<gadget id="calculator">400 / 100</gadget>
<output>4</output>

<result>4</result>