On a map with a scale of 1:4000000, the distance between A and B is 12 cm. Two cars, A and B, drive from A and B at the same time. After meeting each other for 4 hours, car A travels 65 thousand per hour. meters, how many kilometers does car B travel per hour?
在比例尺是1：4000000的地图上，量得A、B两地相距12厘米，甲、乙两辆汽车同时从A、B两地相向开出，经过4小时相遇，甲车每小时行65千米，乙车每小时行多少千米？
<gadget id="calculator">1 / 4_000_000</gadget>
<output>1/4_000_000 = around 0</output>

<gadget id="calculator">12 / (1/4_000_000) / 100_000 / 4</gadget>
<output>120</output>

<gadget id="calculator">120 - 65</gadget>
<output>55</output>

<result>55</result>