It takes 15 days for team A to repair a section of road alone, and the work efficiency of team B is 1/3 of that of team A. How many days will it take for the two teams to jointly repair half of this section of road?
修一段路，甲队单独修要15天完成，乙队的工作效率是甲队的(1/3)，求多少天两队合修这段路的一半？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/15) * (1/3)</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/15) + (1/45)</gadget>
<output>4/45 = around 0.088889</output>

<gadget id="calculator">(1/2) / (4/45)</gadget>
<output>45/8 = around 5.625</output>

<result>45/8 = around 5.625</result>