Two cars, passenger and freight, drive towards each other from places A and B at the same time, and drive at a constant speed. After meeting, the two cars continue to move forward. After a while, the passenger car is still 54 kilometers away from the destination, and the truck is still 189 kilometers away from the destination. It is known The speed of the truck is 80% of that of the passenger car. How many kilometers are there between A and B?
客货两车同时从甲乙两地相向开出，匀速行驶，相遇后两车继续前行，一段时间后，客车离目的地还有54千米，货车离目的地还有189千米，已知货车的速度是客车的80%，甲乙两地相距多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">135 / (1/5)</gadget>
<output>675</output>

<gadget id="calculator">675 + 54</gadget>
<output>729</output>

<result>729</result>