The fast train and the slow train drive from A to B at the same time. When the fast train has traveled the entire distance (3/4), the slow train has just arrived at the midpoint. When the express train arrives at B, the slow train is 36 kilometers away from B. How many kilometers are there between A and B?
快车和慢车同时从甲地开往乙地，当快车行完全程的时(3/4)，慢车正好到达中点．当快车到达乙地时，慢车距乙地36千米．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>3/2 = around 1.5</output>

<gadget id="calculator">1 / (3/2)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">36 / (1/3)</gadget>
<output>108</output>

<result>108</result>