Two cars A and B drive from A and B oppositely at the same time. After 6 hours, the distance traveled by the two cars is 3/5 of the distance between A and B. A travels 42 kilometers per hour, which is 1/7 less than B per hour, so how many kilometers is the distance between A and B?
甲、乙两辆汽车同时从A、B两地相对开出，6小时后两车已行的路程是A、B两地距离的3/5．甲每小时行42千米，比乙每小时少行1/7，那么A、B两地相距多少千米．
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">42 / (6/7)</gadget>
<output>49</output>

<gadget id="calculator">42 + 49</gadget>
<output>91</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">6 / (3/5)</gadget>
<output>10</output>

<gadget id="calculator">91 * 10</gadget>
<output>910</output>

<result>910</result>