Cars A and B are traveling towards each other from AB. A travels the whole distance (4/7) and B travels the whole distance (5/7). The distance between the two cars is 24 kilometers. Find the distance between AB and AB.
甲乙两车从AB两地相向而行，甲行了全程的(4/7)，乙行了全程的(5/7)，两车相距24千米，求AB两地的距离．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(5/7) - 1</gadget>
<output>-2/7 = around -0.285714</output>

<gadget id="calculator">(4/7) + (-2/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">24 / (2/7)</gadget>
<output>84</output>

<result>84</result>