Cars A and B start from A and B at the same time and go towards each other. When they start, the speed ratio of A and B is 5:4. After they meet, the speed of A will decrease by 20%, and the speed of B will increase. 20%, so that when A arrives at B, B's car is still 20 kilometers away from A. Find the distance between A and B in kilometers?
甲、乙两车分别从A、B两地同时出发相向而行，出发时，甲、乙两车的速度比是5：4，相遇后，甲车的速度减少20%，乙车的速度增加20%，这样，当甲到达B地时，乙车离A地还有20千米．求A、B两地相距多少千米？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<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">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">4 * (6/5)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">4 / (24/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / (5/6)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(4/9) * (6/5)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">1 - (4/9) - (8/15)</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">20 / (1/45)</gadget>
<output>900</output>

<result>900</result>