Cars A and B travel from city A to city B at the same speed. Car A starts 120 kilometers first, and then car B starts. Car A arrives at city B and returns immediately, and encounters car B at a distance (1/4) away from city B. How many kilometers are there between cities A and B?
甲乙两车从A城到B城，速度相同．甲车先出发120千米，乙车才出发．甲车到达B城立即返回，在距离B城(1/4)处相遇到乙车，A、B两城相距多少千米？
<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 / (1/4)</gadget>
<output>240</output>

<result>240</result>