It takes 6 hours for the express train to travel from A to B, and 8 hours for the slow train. Two cars depart from A and B oppositely at the same time. When they meet, the express train travels 60 kilometers longer than the slow one. How many kilometers is the distance between A and B?
快车从甲地开往乙地要6小时，慢车要8小时．两车同时从甲乙两地相对开出，相遇时快车比慢车多行60千米，甲乙两地的距离是多少千米？
<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">60 / (1/7)</gadget>
<output>420</output>

<result>420</result>