It takes 10 hours for a passenger car to drive from city A to city B, and it takes 15 hours for another truck to drive from city B to city A. The two cars drive opposite each other at the same time. When they meet, the truck travels 180 kilometers less than the passenger car. What is the total length of the road between A and B in kilometers?
一辆客车从甲城开往乙城要用10小时，另一辆货车从乙城开往甲城要用15小时，两车同时相对开出，相遇时货车比客车少行了180千米，求甲、乙两城间的公路全长是多少千米？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) + (1/15)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<gadget id="calculator">180 / 6</gadget>
<output>30</output>

<gadget id="calculator">(1/10) - (1/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">30 / (1/30)</gadget>
<output>900</output>

<result>900</result>