A car drives from place A to place B, and it has traveled 20 kilometers more than the whole journey (3/10), so it is 260 kilometers away from place B. How many kilometers are there between A and B?
一辆汽车由甲地开往乙地，已行的比全程的(3/10)多20千米，这时距乙地260千米．甲乙两地相距多少千米？
<gadget id="calculator">260 + 20</gadget>
<output>280</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">280 / (7/10)</gadget>
<output>400</output>

<result>400</result>