Two cars, A and B, drive around the city. A travels 8 kilometers per hour, and B travels 6 kilometers per hour. Now two people are walking opposite each other from one place at the same time. After meeting A, B will go back to the original starting point for another 4 hours. Find the time required for B to go around the city for one week?
甲、乙两车绕城而行，甲每小时行8千米，乙每小时行6千米．现在两人同时从一地点相背而行，乙遇到甲后，再行4小时回到原出发点．求乙绕城一周所需要的时间？
<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 * (1/2)</gadget>
<output>3</output>

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

<result>7</result>