A passenger car and a truck respectively depart from A and B in opposite directions at the same time. The speed ratio between the passenger car and the truck is 7:5. After the truck travels (1/3) of the whole journey, it meets the passenger car after traveling 30 kilometers. How many kilometers are there between A and B?
一辆客车和一辆货车分别从甲乙两地同时相向开出．客车和货车的速度比是7：5，货车行了全程的(1/3)后，再行30千米与客车相遇．甲乙两地相距多少千米？
<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

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

<gadget id="calculator">(5/12) - (1/3)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">30 / (1/12)</gadget>
<output>360</output>

<result>360</result>