A train has traveled the entire distance (2/7) from A to B, and it is still 245 kilometers away from B. What is the distance in kilometers between A and B?
一列火车从甲地开往乙地，已经行了全程的(2/7)，距离乙地还有245千米．甲乙两地之间的距离是多少千米？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">245 / (5/7)</gadget>
<output>343</output>

<result>343</result>