A car drives from place A to place B. The ratio of those who have traveled to those that have not traveled is 3:5, and there are still 81 kilometers away from the destination. How many kilometers is the road between the two places?
一辆汽车从甲地开往乙地，已行的和未行的比是3：5，离终点还有81千米，两地之间的公路长多少千米？
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">81 / (5/8)</gadget>
<output>648/5 = around 129.6</output>

<result>648/5 = around 129.6</result>