It takes 5 hours for the fast train to travel from A to B, and 7 hours for the slow train to travel from B to A. On this day, two cars drive from two places at the same time and meet at a distance of 16 kilometers from the midpoint. How many kilometers are there between places A and B?
快车从甲地到乙地需5小时，慢车从乙地到甲地需7小时．这一天，两车同时分别从两地开出，在离中点16千米处相遇，甲乙两地相距多少千米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/5) + (1/7)</gadget>
<output>12/35 = around 0.342857</output>

<gadget id="calculator">1 / (12/35)</gadget>
<output>35/12 = around 2.916667</output>

<gadget id="calculator">(1/5) - (1/7)</gadget>
<output>2/35 = around 0.057143</output>

<gadget id="calculator">2 / (35/12) / (2/35)</gadget>
<output>12</output>

<gadget id="calculator">16 * 12</gadget>
<output>192</output>

<result>192</result>