A car delivers goods from city A to city B. When driving the whole journey (5/13), the car still has 45 kilometers to reach the midpoint of the two places. How many kilometers is the distance between A and B?
一辆汽车从甲城到乙城送货．行驶了全程的(5/13)时，汽车还有45千米就能到达两地的中点，甲乙两城之间的路程是多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">(1/2) - (5/13)</gadget>
<output>3/26 = around 0.115385</output>

<gadget id="calculator">45 / (3/26)</gadget>
<output>390</output>

<result>390</result>