Car A travels 40 kilometers per hour, and car B travels 36 kilometers per hour. The two cars are traveling towards each other from two places at the same time, and meet at a distance of 19 kilometers from the midpoint. How long does it take for the two cars to meet?
甲车每小时行40千米，乙车每小时行36千米，两车同时分别从两地相向而行，在距中点19千米处相遇，问两车开出后多少小时相遇？
<gadget id="calculator">40 - 36</gadget>
<output>4</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">19 * (1/2)</gadget>
<output>19/2 = around 9.5</output>

<result>19/2 = around 9.5</result>