The passenger car departs from A and the truck departs from B. After 5 hours, the passenger car has traveled 75% of the journey, and the truck is still 180 kilometers away from A. It is known that the truck is 20 kilometers faster than the passenger car. Find the distance between A and B.
客车从甲地，货车从乙地，同时相对开出5小时后，客车已行了全程的75%，货车距甲地还有180千米，已知货车比客车快20千米．求甲、乙两地的距离．
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">180 + 100</gadget>
<output>280</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">280 / (1/4)</gadget>
<output>1_120</output>

<result>1_120</result>