It takes 12 hours for a passenger car to drive from place A to place B, and 15 hours for a truck to drive from place B to place A. Now the two cars leave opposite to each other at the same time. After 5 hours, the distance between places A and B is still 135 kilometers. How many kilometers?
客车从甲地开往乙地，需12小时，货车从乙地开往甲地需要15小时，现在两车同时从两地相对开出，经过5小时后还相距135千米，甲乙两地相距多少千米？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

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

<gadget id="calculator">(1/12) + (1/15)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 5</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">135 / (1/4)</gadget>
<output>540</output>

<result>540</result>