The express train and the slow train leave from A and B at the same time, the express train is 80 kilometers per hour, and the slow train is 60 kilometers per hour. After 3 hours, the express train travels 40% of the distance. How many kilometers are the distance between the two cars?
快车和慢车同时从甲，乙两地相对开出，快车每小时80千米，慢车每小时60千米，3小时后快车行了全程的40%，此时两车相距多少千米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / (2/5)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">80 * (15/2)</gadget>
<output>600</output>

<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">140 * 3</gadget>
<output>420</output>

<gadget id="calculator">600 - 420</gadget>
<output>180</output>

<result>180</result>