Cars A and B start from places A and B respectively and drive towards each other. The speed ratio of cars A and B is 7:9. After meeting, they continue to move forward and return immediately after reaching the destination. The second time A leaves B Meet B at 80 kilometers from the ground, how many kilometers is the distance between A and B?
甲、乙两车分别从A、B两地出发，相向而行，甲、乙两车速度比是7：9，相遇后继续向前，到达目的地后立即返回，第二次甲在离B地80千米处与乙相遇，问A、B相距多少千米？
<gadget id="calculator">7 + 9</gadget>
<output>16</output>

<gadget id="calculator">7 / 16</gadget>
<output>7/16 = around 0.4375</output>

<gadget id="calculator">3 * (7/16)</gadget>
<output>21/16 = around 1.3125</output>

<gadget id="calculator">(21/16) - 1</gadget>
<output>5/16 = around 0.3125</output>

<gadget id="calculator">80 / (5/16)</gadget>
<output>256</output>

<result>256</result>