A passenger car and a truck drive in opposite directions from the midpoint of A and B at the same time for 6 hours. After the bus arrives at B, the truck is still 30 kilometers away from A. It is known that the speed ratio of the truck to the passenger car is 6:7. , How many kilometers are the distance between the two places?
客车和货车同时从甲、乙两地的中点向相反方向行驶6小时，客车到达乙地后，货车离甲地还有30千米，已知货车与客车的速度比是6：7，甲、乙两地相距多少千米．
<gadget id="calculator">7 - 6</gadget>
<output>1</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">30 / (1/14)</gadget>
<output>420</output>

<result>420</result>