Cars A and B depart from places A and B respectively. Walk towards each other. When starting out, the speed ratio of A and B is 5:4. After meeting, A's speed is reduced by 20%, so that when A arrives at B, B is still 15 kilometers away from A. Question: How many miles is the distance between A and B?
甲、乙两车分别从A，B两地出发，．相向而行．出发时，甲、乙的速度比是5：4，相遇后，甲的速度减少20%，这样当甲到达B地时，乙离A地还有15千米．问：A，B两地相距多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 * (4/5)</gadget>
<output>4</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(4/5) / 9</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">5 * (4/45)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(5/9) - (4/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">15 / (1/9)</gadget>
<output>135</output>

<result>135</result>