Two cars, A and B, leave opposite places A and B at the same time. Car A travels 81 kilometers per hour, and it takes 10 hours for car B to complete the journey. When Car B completes the journey (13/30), the After the whole journey (3/8), find the distance between A and B in kilometers.
甲、乙两车同时从A，B两地相对开出，甲车每小时行81千米，乙车行完全程要10小时，当乙车行完全程的(13/30)时，甲车行了全程的(3/8)，求甲、乙两地相距多少千米．
<gadget id="calculator">13 / 30</gadget>
<output>13/30 = around 0.433333</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(13/30) / (1/10)</gadget>
<output>13/3 = around 4.333333</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(13/3) / (3/8)</gadget>
<output>104/9 = around 11.555556</output>

<gadget id="calculator">81 * (104/9)</gadget>
<output>936</output>

<result>936</result>