Drive from place A to place B, stop and rest after driving 20% of the whole journey, and then drive 84 kilometers. At this time, the ratio of the distance traveled to the distance not traveled is 3:5. How many kilometers are there between A and B?
从甲地开往乙地，行驶了全程的20%后停车休息，接着再行驶84千米，此时已行驶的路程与未行驶的路程的比是3：5．甲，乙两地相距多少千米？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

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

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(3/8) - (1/5)</gadget>
<output>7/40 = around 0.175</output>

<gadget id="calculator">84 / (7/40)</gadget>
<output>480</output>

<result>480</result>