Master Wang processes 140 parts per hour, and Master Li processes 120 parts per hour. Master Li processes for 2 hours before Master Wang starts processing. After a few hours, the number of parts processed by Master Wang is equal to that of Master Li?
王师傅每小时加工零件140个，李师傅每小时加工零件120个，李师傅先加工2小时后王师傅才开始加工，几小时后王师傅加工的零件数和李师傅相等？
<gadget id="calculator">140 - 120</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">120 * (1/10)</gadget>
<output>12</output>

<gadget id="calculator">12 + 2</gadget>
<output>14</output>

<result>14</result>