car drives from place A to place B. When it travels the whole distance (3/4), the distance from the midpoint is 12 kilometers. How many kilometers are there between places A and B?
一辆汽车从甲地开往乙地，行了全程的(3/4)时，离中点的距离是12千米，甲乙两地相距多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/4) - (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 / (1/4)</gadget>
<output>48</output>

<result>48</result>