Cars A and B travel from city A to city B at the same speed. Car A starts first, and after traveling 50 kilometers, car B starts. Car A returns immediately after arriving at City B, and meets Car B at a distance (1/4) away from City B. What is the distance in kilometers between the two cities AB?
甲、乙两车都从A城到B城，速度相同．甲车先出发，行了50千米后，乙车才出发．甲车到达B城后立即返回，在距离B城(1/4)处与乙车相遇．AB两城的距离是多少千米．
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

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

<gadget id="calculator">25 / (1/4)</gadget>
<output>100</output>

<result>100</result>