Two cars A and B are driving toward each other from two places at the same time. Car A is driving 45 kilometers per hour, and car B is traveling 42 kilometers per hour. The two cars meet at a distance of 1.2 kilometers from the midpoint. Meet in hours.
甲、乙两辆汽车同时从两地相向而行，甲车每小时45千米，乙车每小时行42千米，两车在距离中点1.2千米处相遇，两车同时开车后经过多少小时相遇．
<gadget id="calculator">1.2 * 2</gadget>
<output>2.4</output>

<gadget id="calculator">45 - 42</gadget>
<output>3</output>

<gadget id="calculator">2.4 / 3</gadget>
<output>0.8</output>

<result>0.8</result>