On a map with a scale of (1/5000000), the distance between A and B is 6 cm. Two cars, A and B, drive from the two places at the same time and meet each other after 4 hours. The speed ratio is 7:8, how many kilometers per hour does car A travel?
在比例尺为(1/5000000)的地图上，量得A、B两地的距离为6厘米，甲、乙两辆汽车分别从两地同时相向开出，经过4小时相遇，甲、乙两车的速度比是7：8，甲汽车每小时行多少千米？
<gadget id="calculator">1 / 5_000_000</gadget>
<output>1/5_000_000 = around 0</output>

<gadget id="calculator">6 / (1/5_000_000) / 100_000 / 4</gadget>
<output>75</output>

<gadget id="calculator">7 + 8</gadget>
<output>15</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">75 * (7/15)</gadget>
<output>35</output>

<result>35</result>