A car travels from place A to place B. It travels 15% of the journey in the first hour and 30% of the journey in the second hour. It travels a total of 180 kilometers in two hours. How many kilometers is 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15%，第二小时行了全程的30%，两小时一共行了180千米，甲乙两地全长多少千米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/10) + (3/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">180 / (9/20)</gadget>
<output>400</output>

<result>400</result>