A and B drive towards each other from A and B at the same time. When they meet for the first time, A travels the whole distance (3/5). Immediately after landing, they return at the same speed, and the distance between the second meeting point and the first meeting point is 120 kilometers. How many kilometers are there between A and B?
甲、乙二人分别驾车从A，B两地同时相向而行，第一次相遇时甲行了全程的(3/5)，相遇后两人继续前进，甲和乙分别到达B，A两地后立即又以原速返回，第二次相遇地点和第一次相遇点相距120千米．A，B两地相距多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) * 3</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(9/5) - 1 - (2/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>