From A to B, it takes 6 hours for the fast train and 8 hours for the slow train. Now the express train and the slow train depart from places A and B at the same time respectively and drive in opposite directions. How many hours later will the two cars meet?
从甲地到乙地，快车走完全程要6小时，慢车走完全程要8小时．现在快车和慢车分别从甲、乙两地同时出发，相向行驶，几小时后两车相遇？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">(1/6) + (1/8)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">1 / (7/24)</gadget>
<output>24/7 = around 3.428571</output>

<result>24/7 = around 3.428571</result>