It takes 40 days for engineering team A to repair a road alone, and 60 days for engineering team B to repair it alone. If the two teams work together, how many days can it be completed?
修一条路，甲工程队单独干要40天修完，乙工程队单独干要60天修完，如果两队合修，几天可以修完？
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

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

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

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

<result>24</result>