Two cars, A and B, drive from cities A and B at the same time. After 2 hours, they meet in city C, which is 20 kilometers away from the midpoint. /5), how many kilometers is the distance between A and B?
甲、乙两辆汽车同时从A、B两个城市相对开出，经过2小时后在距离中点20千米的C城相遇，相遇时甲车刚好行驶完A、B两城距离的(3/5)，A、B两城相距多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">20 / (1/10)</gadget>
<output>200</output>

<result>200</result>