The master makes 360 parts in 3 hours, and the apprentice makes 400 parts in 4 hours. Who is faster? How much faster?
师傅3小时做360个零件，徒弟4小时做400个零件，谁的速度快？快多少？
<gadget id="calculator">360 / 3</gadget>
<output>120</output>

<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">120 - 100</gadget>
<output>20</output>

<result>20</result>