Cars A and B start from cities A and B at the same time and drive toward each other. A travels 60 kilometers per hour, and B travels 50 kilometers per hour. Two hours after departure, B travels the entire distance (3/7). How many kilometers are the distance between A and B?
甲、乙两车同时从A、B两城出发相向而行．甲每小时行60千米，乙每小时行50千米，出发2小时后乙车行了全程的(3/7)，A、B两城相距多少千米？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

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

<gadget id="calculator">100 / (3/7)</gadget>
<output>700/3 = around 233.333333</output>

<result>700/3 = around 233.333333</result>