It is known that the speed of the truck is (3/4) of the speed of the passenger car. Two cars depart from stations A and B at the same time and meet at a distance of 6 kilometers from the midpoint. What is the distance between the two stations in kilometers?
已知货车速度是客车速度的(3/4)．两车同时分别由甲、乙两站相对开出，在离中点6千米处相遇，则两站相距多少千米．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">2 / (1/7)</gadget>
<output>14</output>

<gadget id="calculator">6 * 14</gadget>
<output>84</output>

<result>84</result>