Zhang Ming travels 6 kilometers per hour from place A to place B. Li Fang rides a bicycle from place B to place A and travels 12 kilometers per hour. How many kilometers are the distance between A and B?
张明从甲地到乙地，每小时行6千米，李芳从乙地到甲地，骑自行车每小时行12千米，两人同时出发，然后在离甲、乙两地中点12千米处相遇，甲、乙两地相距多少千米？
<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<gadget id="calculator">12 * (1/3) * 18</gadget>
<output>72</output>

<result>72</result>