A project alone takes 12 days to complete, and B can complete (1/3) of the project in 5 days. Now A and B cooperate, how many days will complete the whole project (3/4)?
一项工程，甲单独做要12天完成，乙5天可完成这项工程的(1/3)，现在由甲乙两人合作，几天完成全工程的(3/4)？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>