The master produces 64 machine parts per hour, and the apprentice produces 48 parts per hour. If the master produces the parts in 3 hours, how many hours does the apprentice need to complete?
师傅每小时生产机器零件64个，徒弟每小时生产48个零件，师傅3小时生产的零件，徒弟要几小时完成？
<gadget id="calculator">3 / 48</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">64 * (1/16)</gadget>
<output>4</output>

<result>4</result>