A and C respectively start from A and B at the same time and walk toward each other. After 10 minutes, B starts from point A to point B. After 5 minutes, B catches up with A, and after another 10 minutes, B meets C, and after another 10 minutes, A and C meet. If A's speed is 6 km/h, what is the distance between A and B in kilometers?
甲、丙分别从A、B两地同时出发，相向而行．10分钟后，乙从A地出发前往B地．5分钟后乙追上甲，又过了10分钟，乙遇到丙，再过10分钟，甲和丙相遇．若甲的速度是6千米/时，则A、B两地相距多少千米．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/6) / (1/12)</gadget>
<output>2</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

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

<gadget id="calculator">18 * (1/6)</gadget>
<output>3</output>

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

<gadget id="calculator">6 * (1/3)</gadget>
<output>2</output>

<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

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

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">12 * (7/12)</gadget>
<output>7</output>

<result>7</result>