Vehicles A and B are traveling towards each other from A and B respectively, and meet at a distance of 120km from A. After meeting, the two vehicles continue to move forward at the original speed, return immediately after arriving at the starting point of the other party, and meet again on the way. The distance from the second meeting place to B is (2/7) of the distance between A and B. How many kilometers are there between A and B?
甲、乙两车分别从A、B两地相向而行，在距离A地120km处相遇．相遇后，两车继续以原来的速度前进，到达对方出发地后马上返回，在途中再次相遇．第2次相遇的地点到B地的距离是A、B两地路程的(2/7)．A、B两地相距多少千米？
<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">120 + 240</gadget>
<output>360</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(2/7) + 1</gadget>
<output>9/7 = around 1.285714</output>

<gadget id="calculator">360 / (9/7)</gadget>
<output>280</output>

<result>280</result>