It takes 20 hours for a car to transport the goods from the city to the mountainous area, and the time it takes to go is 1.5 times that of the time to go back, and the time to go is 12 kilometers slower than the time to go back. How many miles has the car traveled in total?
一辆汽车把货物从城市运往山区，往返共用了20小时，去时所用时间是回来的1.5倍，去时每小时比回来时慢12公里．这辆汽车往返共行驶了多少公里．
<gadget id="calculator">1 + 1.5</gadget>
<output>2.5</output>

<gadget id="calculator">20 / 2.5</gadget>
<output>8</output>

<gadget id="calculator">8 * 1.5</gadget>
<output>12</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">12 / (1/24)</gadget>
<output>288</output>

<gadget id="calculator">288 * 2</gadget>
<output>576</output>

<result>576</result>