Teams A, B, and C have to complete two projects A and B. The workload of project B is more than that of project A (1/4). It is known that it takes 40 days for team A to complete project A alone, and it takes 60 days and 75 days for teams B and C to complete project B alone. At the beginning, team A worked on project A, and teams B and C jointly worked on project B; a few days later, team C was transferred to work with team A to complete project A, and team B was left to work on project B alone. As a result, the two projects were completed at the same time. May I ask: How many days did Team C and Team B work together?
甲、乙、丙三队要完成A，B两项工程．B工程的工作量比A工程的工作量多(1/4)，已知甲队单独完成A工程要40天，乙、丙两队单独完成B工程分别需要60天、75天．开始时甲队做A工程，乙、丙两队共同做B工程；几天后，又调丙队与甲队共同完成A工程，剩下乙队单独做B工程，结果两个工程同时完成．请问：丙队与乙队合做了多少天？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

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

<gadget id="calculator">(5/4) * (1/40)</gadget>
<output>1/32 = around 0.03125</output>

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

<gadget id="calculator">(5/4) * (1/60)</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">(1/48) - (1/60)</gadget>
<output>1/240 = around 0.004167</output>

<gadget id="calculator">(1/32) + (1/240)</gadget>
<output>17/480 = around 0.035417</output>

<gadget id="calculator">(1/60) * (1/40)</gadget>
<output>1/2_400 = around 0.000417</output>

<gadget id="calculator">(1/60) * (1/60)</gadget>
<output>1/3_600 = around 0.000278</output>

<gadget id="calculator">1 / 75</gadget>
<output>1/75 = around 0.013333</output>

<gadget id="calculator">(1/75) * (1/40)</gadget>
<output>1/3_000 = around 0.000333</output>

<gadget id="calculator">(1/75) * (1/60)</gadget>
<output>1/4_500 = around 0.000222</output>

<gadget id="calculator">(1/40) * (1/60)</gadget>
<output>1/2_400 = around 0.000417</output>

<gadget id="calculator">(1/4_500) - (1/2_400)</gadget>
<output>-7/36_000 = around -0.000194</output>

<gadget id="calculator">(1/2_400) + (1/3_600) + (1/3_000) + (-7/36_000)</gadget>
<output>1/1_200 = around 0.000833</output>

<gadget id="calculator">(17/480) / (1/1_200)</gadget>
<output>85/2 = around 42.5</output>

<result>85/2 = around 42.5</result>