It takes 8 hours for A to print a document alone, and the work efficiency of B is 3 times that of A. Now that the two are working together at the same time, how many hours will it take to type half of this manuscript?
打印一种文稿，甲单独完成需要8小时，乙的工效是甲的3倍．现在两人同时合作，要多少小时才能打完这种文稿的一半？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) + (3/8)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / (1/2)</gadget>
<output>1</output>

<result>1</result>