To build a road, team A can complete it in 6 hours a day in 4 days; team B can complete it in 5 days by repairing it in 8 hours a day. Now let teams A and B work together to complete the work in 2 days, how many hours should they work each day?
修一条路，甲队每天修6小时，4天可以完成；乙队每天修8小时，5天可以完成．现在让甲、乙两队合修，要求2天完成，每天应修多少小时．
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</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">(1/24) + (1/40)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15) / 2</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>