A fast train and a slow train leave opposite directions at the same time. After 3 hours, the two trains meet. The ratio of the distance traveled by the two trains when they meet is 7:5. The slow train travels 16 kilometers less than the express train per hour. rice?
一列快车和一列慢车同时从两地相向开出，3小时后两车相遇，相遇时两车所行的路程比是7：5，慢车比快车每小时少行16千米，两地相距多少千米？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(7/12) - (5/12)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 / (1/6)</gadget>
<output>18</output>

<gadget id="calculator">16 * 18</gadget>
<output>288</output>

<result>288</result>