There is a 48-kilometer old road in a certain place that needs to be rebuilt. It will take 60 days for construction team A to complete it alone, and it will take 40 days for construction team B to complete it alone. After A completes (1/4) alone, how many days will it take for A and B to cooperate?
某地有一条48千米的旧道路需改造，甲施工队单独做要60天完成，乙施工队单独做要40天完成．甲先单独完成(1/4)后，由甲、乙两队合作，还需要多少天才能完成？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<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">(3/4) / (1/24)</gadget>
<output>18</output>

<result>18</result>