From city A to city B, a car travels 40% of the whole journey in the first hour, and travels 12 kilometers longer in the second hour than in the first hour. At this time, the distance from city B is exactly the full distance (1/10). How many kilometers is the whole journey?
从甲城到乙城，一辆汽车第一小时行了全程的40%，第二小时比第一小时多行12千米，这时离乙城的距离恰好是全程的(1/10)，全程长多少千米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (2/5) - (2/5) - (1/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">12 / (1/10)</gadget>
<output>120</output>

<result>120</result>