Two cars drive oppositely from two cities 400 kilometers apart at the same time. It takes 8 hours for a car to drive from city A to city B, and 10 hours for a truck to drive from city B to city A. After how many hours did the two cars meet? (Solved using two arithmetic methods)
两辆汽车同时从相距400千米的两城相对开出．汽车从A城开往B城需要8小时，货车从B城开往A城需要10小时．经过几小时两车相遇？(用两种算术方法解答)
<gadget id="calculator">400 / 8</gadget>
<output>50</output>

<gadget id="calculator">400 / 10</gadget>
<output>40</output>

<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">400 / 90</gadget>
<output>40/9 = around 4.444444</output>

<result>40/9 = around 4.444444</result>