It takes 12 days for a batch of goods to be transported by team A alone, and 8 days for team B to transport alone. Now Team B will transport the goods for 5 days first, and then Team A will continue to transport them. How many days will it take to finish transporting this batch of goods?
一批货物，由甲队独运要12天完成，由乙队独运要8天完成．现乙队先运5天，然后由甲队接着运，几天才能运完这批货物？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 5</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(3/8) / (1/12)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>