A passenger car and a truck depart from two stations A and B at the same time and meet at a distance of 20km from the midpoint. If the speed of the passenger car is 1.5 times the speed of the truck, then how many kilometers are the distance between the two stations A and B?
一辆客车与一辆货车分别从A、B两站同时相对开出，在距离中点20km处相遇．如果客车的速度是货车速度的1.5倍，那么A、B两站相距多少km．
<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">2 / 0.5</gadget>
<output>4</output>

<gadget id="calculator">1 + 1.5</gadget>
<output>2.5</output>

<gadget id="calculator">20 * 4 * 2.5</gadget>
<output>200</output>

<result>200</result>