The fast and slow trains depart from places A and B at the same time and meet each other after 5 hours. After meeting, the two cars continue to drive at the original speed, and the express train arrives at point B after another 3 hours. The slow train is 180 kilometers away from point A. How long is the road between A and B in kilometers?
快、慢两车从A、B两地同时相对开出，经过5小时相遇．相遇后两车继续按原速度行驶，又经过3小时快车到达B地，慢车距A地180千米，问A、B两地的公路长多少千米？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8 / 5</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">(3/40) * 8</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">180 / (2/5)</gadget>
<output>450</output>

<result>450</result>