To make a batch of parts, it takes 12 hours for A to complete alone. It is known that the working efficiency ratio of A and B is 4:3, so how long will it take B to complete alone? (answer with ratio)
制作一批零件，甲单独完成要12小时，已知甲、乙的工作效率比是4：3，那么乙单独完成要多长时间？(用比例解答)
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(4/3) * 12</gadget>
<output>16</output>

<result>16</result>