Master Wang and Xiao Li make a kind of parts, and they do it non-stop for 1 hour. Master Wang can make 20 parts, and Xiao Li can make 12 parts. In order to ensure the quality, every hour, Master Wang has to inspect the parts made by Xiao Li and guide Xiao Li to improve. For each inspection, Master Wang will spend 15 minutes, and Xiao Li will also spend 10 minutes. Working in this way for 3 hours, how many parts did the two make in total?
王师傅和小李做一种零件，不停地做1小时，王师傅能做20个，小李能做12个．为了确保质量，在每一小时中，王师傅要对小李做的零件进行检查，并指导小李改进，每次检查，王师傅要花去15分钟，小李也要花去10分钟．这样工作3小时，两人一共做了多少个零件．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">60 - 15</gadget>
<output>45</output>

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

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">60 - 10</gadget>
<output>50</output>

<gadget id="calculator">(1/5) * 50 * 3</gadget>
<output>30</output>

<gadget id="calculator">45 + 30</gadget>
<output>75</output>

<result>75</result>