A car drives from city A to city B, and travels the whole journey (3/5) in 3 hours. At this time, it is still 120 kilometers away from city B. How many kilometers is the distance between A and B?
一辆汽车从甲城开往乙城，3个小时行了全程的(3/5)，这时距乙城还有120千米，甲乙两成相距多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>