It takes 4 hours for a passenger car to drive from A to B, which is 80% of the time taken by a truck. Now two cars drive from A to B at the same time. In 2.5 hours, the distance between the two cars is 20 kilometers. How many kilometers is the distance between A and B?
客车从甲地开往乙地要4小时，是货车所用时间的80%，现在两车同时从甲地开往乙地，2.5小时候两车相距20千米，求甲乙两地相距多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 2.5</gadget>
<output>0.125</output>

<gadget id="calculator">20 / 0.125</gadget>
<output>160</output>

<result>160</result>