A car has traveled the entire distance (3/7) from A to B. If it travels another 10 kilometers, the remaining distance is the same as the distance traveled. How many kilometers are there between A and B?
一辆汽车从甲地开往乙地，已经行了全程的(3/7)，如果再行10千米，剩下的路程和行过的路程同样多，甲乙两地相距多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/2) - (3/7)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">10 / (1/14)</gadget>
<output>140</output>

<result>140</result>