To build a road, Team A can complete it in 5 days with 8 hours a day; Team B can complete it in 6 days with 10 hours a day. Two teams cooperate and work 6 hours a day, how many days to complete the task.
修一条路，甲队每天修8小时，5天完成；乙队每天修10小时，6天完成．两队合作，每天工作6小时，多少天完成任务．
<gadget id="calculator">10 * 6</gadget>
<output>60</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/60) + (1/40)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / (1/24) / 6</gadget>
<output>4</output>

<result>4</result>