Traveling between stations A and B, the express train takes 4 hours and the slow train takes 6 hours. If they drive from the two stations A and B at the same time, they can meet at a distance of 35 kilometers from the center. What is the distance in kilometers between stations A and B?
行驶于A、B两站之间，快车要4小时，慢车要6小时．如果它们分别从A、B两站同时相向开出，可在距中心35千米的地方相遇．问A、B两站相距多少千米？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) + (1/6)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 / (5/12)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">(1/4) - (1/6)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">2 / (12/5) / (1/12)</gadget>
<output>10</output>

<gadget id="calculator">35 * 10</gadget>
<output>350</output>

<result>350</result>