The distance between A and B is several kilometers. It takes 12 hours for A to travel alone. Now A and B start from A and B at the same time and walk toward each other. After driving together for 4 hours, A stops for something. After getting down, B walked alone for another 6 hours before meeting A. How many hours does it take for B to walk the entire distance alone?
A、B两地之间相距若干千米，甲单独行完全程需要12小时，现在甲、乙二人分别从A、B两地同时出发，相向而行，共同行驶4小时后，甲有事停了下来，乙又单独走了6小时，才与甲相遇．乙单独走完全程需要几小时？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 4</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">(2/3) / 10</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>