On a map with a scale of 1:5000000, the measured distance between places A and B is 6.3cm. If two cars A and B drive towards each other at the same time, car A will travel 48 km per hour, and car B will travel 42 km per hour. When did the two cars meet?
在比例尺是1：5000000的地图上，量的A，B两地距离是6.3cm，如果甲、乙两车同时从两地相向而行，甲车每时行48km，乙车每时行42km，几时两车相遇？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">48 + 42</gadget>
<output>90</output>

<gadget id="calculator">6.3 / (1/5_000_000) / 100_000 / 90</gadget>
<output>3.5</output>

<result>3.5</result>