It takes 8 hours for a passenger train to travel from A to B, and 12 hours for a truck to travel from B to A. Now the two trains depart opposite from each other at the same time. When they meet, how much of the whole journey has the passenger train traveled?
一列客车从甲地到乙地需要8小时，一列货车从乙地到甲地需要12小时．现在两列车同时从两地相对开出，相遇时，客车行了全程的多少．
<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>5/24 = around 0.208333</output>

<gadget id="calculator">1 / (5/24)</gadget>
<output>24/5 = around 4.8</output>

<gadget id="calculator">(24/5) * (1/8)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>