A truck and a car leave opposite each other from cities A and B at the same time. After meeting, the two cars continue to drive forward. When the car arrives at A and the truck arrives at B. Return immediately, the second meeting point is 120 kilometers away from city A, it is known that the speed ratio of trucks and cars is 3:4, how many kilometers are the distance between cities A and B?
一辆卡车与一辆小轿车同时从甲、乙两城相对开出，相遇后两车继续向前行驶．当小轿车到达甲地、卡车到达乙地后．立即返回，第二次相遇点距甲城120千米，已知：卡车与小轿车的速度比是3：4，甲、乙两城相距多少千米？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) * 4 * 3</gadget>
<output>12/7 = around 1.714286</output>

<gadget id="calculator">(12/7) - 1</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">120 / (5/7)</gadget>
<output>168</output>

<result>168</result>