On a map with a scale of 1:6000000, the distance from city A to city B is 4.5 cm. Two cars, A and B, start from A and B at the same time and meet each other after 2 hours. It is known that car A travels 70 kilometers per hour, how many kilometers per hour does car B travel
在一幅比例尺是1：6000000的地图上，量得A城到B城的距离是4.5厘米．甲、乙两辆汽车同时从A、B两地相向出发，经过2小时相遇．已知甲车每小时行70千米，乙车每小时行多少千米
<gadget id="calculator">1 / 6_000_000</gadget>
<output>1/6_000_000 = around 0</output>

<gadget id="calculator">4.5 / (1/6_000_000) / 100_000 / 2</gadget>
<output>135</output>

<gadget id="calculator">135 - 70</gadget>
<output>65</output>

<result>65</result>