Two cars, A and B, start from places A and B at the same time and drive toward each other. When car A reaches a point (2/7) away from point B, car B exceeds the midpoint by 30 kilometers. At this time, car A is faster than car B. The car travels an extra 45 kilometers, how many kilometers is the distance between A and B?
甲、乙两辆汽车分别同时从A、B两地出发相向而行，当甲车行至离B地(2/7)处时，乙车超过中点30千米，这时甲车比乙车多行45千米，A、B两地相距多少千米？
<gadget id="calculator">30 + 45</gadget>
<output>75</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (2/7) - (1/2)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">75 / (3/14)</gadget>
<output>350</output>

<result>350</result>