A car travels from place A to place B. In the first hour, it travels 25% of the whole journey. In the second hour, it travels 20 kilometers more than in the first hour. There are still 120 kilometers left. How many kilometers are the total length of places A and B?
一辆汽车从甲地到乙地，第一小时行了全程的25%，第二小时比第一小时多行20千米，还剩下120千米，甲乙两地全长多少千米？
<gadget id="calculator">120 + 20</gadget>
<output>140</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) + (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">140 / (1/2)</gadget>
<output>280</output>

<result>280</result>