Cars A and B are traveling toward each other from places A and B at the same time, and meet each other in 6 hours. After meeting, the two cars continue to move forward, and car A arrives at place B in another 4 hours. How many hours will it take for car B to complete the journey?
甲、乙两辆汽车同时从A、B两地相向而行，6小时相遇，相遇后两车继续前进，再过4小时甲车到达B地．乙车行完全程共要多少小时？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/6) - (1/10)</gadget>
<output>1/15 = around 0.066667</output>

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

<result>15</result>