Car A and car B leave opposite places at the same time from places A and B. It is known that car A travels 42 kilometers per hour, and car B travels at the speed of car A (6/7). After 4 hours, the full-length 75%, how many kilometers is the distance between A and B?
甲、乙两车同时从A、B两地相对开出，已知甲车每小时行42千米，乙车的速度是甲车的(6/7)，经过4小时后，行完全长的75%，求A、B两地距离是多少千米？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">42 * (6/7)</gadget>
<output>36</output>

<gadget id="calculator">42 + 36</gadget>
<output>78</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4 / (3/4)</gadget>
<output>16/3 = around 5.333333</output>

<gadget id="calculator">78 * (16/3)</gadget>
<output>416</output>

<result>416</result>