On a map with a scale of 1:5000000, the distance between the two places is 8 cm. Two cars, A and B, drive from opposite places at the same time and meet each other 4 hours later. Car A travels 40 kilometers per hour, how many kilometers per hour does Car B travel?
在比例尺1：5000000的地图上，量得两地之间的距离是8厘米．甲乙两辆汽车同时从两地相对开出，4小时后相遇．甲汽车每小时行40千米，乙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">8 / (1/5_000_000) / 100_000 / 4</gadget>
<output>100</output>

<gadget id="calculator">100 - 40</gadget>
<output>60</output>

<result>60</result>