A passenger car has driven 80 kilometers from city A to city B, which is the remaining distance (4/5). How many kilometers are there between the two cities?
一辆客车从甲城开往乙城，已经行驶了80千米，是剩下路程的(4/5)，甲乙两城相距多少千米？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">80 / (4/5)</gadget>
<output>100</output>

<gadget id="calculator">100 + 80</gadget>
<output>180</output>

<result>180</result>