For the same kind of parts, Master Wang can process 600 parts in 5 hours, and Master Li can process 450 parts in 3 hours. Which of the two works faster? How much faster?
加工同一种零件，王师傅5小时能加工600个零件，李师傅3小时能加工450个零件．两人谁的工作效率快？快多少？
<gadget id="calculator">450 / 3</gadget>
<output>150</output>

<gadget id="calculator">600 / 5</gadget>
<output>120</output>

<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<result>30</result>