Two cars are traveling towards each other from two cities at the same time. Car A travels 39 kilometers per hour, and car B travels 48 kilometers per hour. The two cars meet at a distance of 40.5 kilometers from the midpoint. Looking for a time to meet?
两辆汽车分别从两城同时相向而行，甲车每小时行39千米，乙车每小时行48千米，两车在离中点40.5千米处相遇．求相遇的时间？
<gadget id="calculator">48 - 39</gadget>
<output>9</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">40.5 * (2/9)</gadget>
<output>9</output>

<result>9</result>