There are 48 kilometers of old urban roads in the urban area that need to be renovated. Construction team A will do it independently and it will take 60 days to complete it; construction team B will do it independently and it will take 40 days to complete it. How many days will it take for teams A and B to work together?
城区有48千米旧城道路需要改造，甲施工队独立做，要60天完成；乙施工队独立做，要40天完成．甲乙两队合做，需要多少天才能完成？
<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</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)</gadget>
<output>24</output>

<result>24</result>