It takes 30 days to process a batch of parts, and A and B are combined to do it. If it takes 50 days for team A to complete it alone, how many days will it take for team B to do it alone?
加工一批零件，甲、乙两个小组合做，需要30天完成．如果由甲小组单独做需要50天完成，如果由乙小组单独做，需要多少天完成？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/30) - (1/50)</gadget>
<output>1/75 = around 0.013333</output>

<gadget id="calculator">1 / (1/75)</gadget>
<output>75</output>

<result>75</result>