One project can be completed by Lao Wang alone in 45 hours, and by Lao Li in 60 hours alone. Now the two are working together, Lao Wang works 3 hours a day, Lao Li works 8 hours a day, how many days can the two work together to complete this project?
一项工程，老王单独做45小时可以完成，老李单独做60小时可以完成．现在两人合做，老王每天工作3小时，老李每天工作8小时，两人合做几天可以完成这项工程？
<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/45) * 3</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/60) * 8</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(1/15) + (2/15)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / (1/5)</gadget>
<output>5</output>

<result>5</result>