To build a 45-kilometer road, A can complete the project in 8 days alone, and B can only complete (4/5) of the project in 8 days. If A and B work together, how long will it take to complete the road?
修一条45千米的公路，甲独修8天可以完成，乙独修8天只能完成这项工程的(4/5)，如果甲、乙合做，多少时间才能修完这段路？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 8</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">1 / (9/40)</gadget>
<output>40/9 = around 4.444444</output>

<result>40/9 = around 4.444444</result>