From point A to point B, it takes 8 hours for car A and 10 hours for car B. Now two cars A and B start from A and B respectively, go towards each other, and meet at a place 20 kilometers away from the midpoint. How many kilometers are there between A and B?
从A地到B地，甲车要8小时，乙车要10小时．现甲、乙两车分别从A、B两地出发，相向而行，在距中点20千米的地方相遇．A、B两地相距多少千米？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) - (1/10)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">1 / (9/40)</gadget>
<output>40/9 = around 4.444444</output>

<gadget id="calculator">(1/40) * (40/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">2 / (1/9)</gadget>
<output>18</output>

<gadget id="calculator">20 * 18</gadget>
<output>360</output>

<result>360</result>