freight train and a passenger train depart from A and B at the same time. It is known that the speed of the passenger train is 80 kilometers per hour, and it takes 5 hours for the freight train to travel from A to B. The distance between the two cars is 20 km after driving for 2 hours. How many kilometers is the distance between A and B?
一列货车和一列客车从甲、乙两地同时相对开出，已知客车的速度是每小时80千米，货车从甲地到乙地需要5小时．两车开出2小时后相距20km，甲、乙两地相距多少千米？
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">160 + 20</gadget>
<output>180</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">180 / (3/5)</gadget>
<output>300</output>

<result>300</result>