To build a road, Team A will complete the task in 12 days after repairing it for 5 hours a day; Team B will complete the task in 15 days after repairing it for 6 hours per day. After the two teams cooperate, they will practice for 6 hours a day. How many days can the two teams cooperate to complete the task?
修一条路，甲队每天修5小时，12天完成任务；乙队每天修6小时，15天完成任务．两队合作后，每天修6小时，问两队合作多少天可以完成任务？
<gadget id="calculator">5 * 12</gadget>
<output>60</output>

<gadget id="calculator">6 / 60</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 * 15</gadget>
<output>90</output>

<gadget id="calculator">6 / 90</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) + (1/15)</gadget>
<output>1/6 = around 0.166667</output>

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

<result>6</result>