A car drives from place A to place B, the distance traveled is 84 kilometers longer than the whole journey (1/3), and the ratio of the distance traveled to the distance not traveled is exactly 9:11. Find the distance in kilometers between A and B.
一辆汽车从甲地开往乙地，已行的路程比全程的(1/3)多84千米，正好已行路程与未行路程的比是9：11．求甲、乙两地相距多少千米．
<gadget id="calculator">9 + 11</gadget>
<output>20</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(9/20) - (1/3)</gadget>
<output>7/60 = around 0.116667</output>

<gadget id="calculator">84 / (7/60)</gadget>
<output>720</output>

<result>720</result>