Cars A and B travel from city A to city B at the same speed. Car A travels 12 kilometers first before car B sets off. Car A returns immediately after arriving at city B and encounters car B at a distance (1/4) from city B (1/4 from city B to city A) ． How many miles is the distance between AB and AB?
甲乙两车从A城到B城，它们的速度相同．甲车先走12千米后，乙车才出发，甲车到B城后立即返回，在距B城(1/4)处(B城到A城的(1/4))碰到乙车．AB两城相距多少千米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

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

<gadget id="calculator">6 / (1/4)</gadget>
<output>24</output>

<result>24</result>