The master and apprentice work together to make 446 parts, the master processes 45 parts per hour, and the apprentice processes 38 parts per hour. The apprentice does 3 hours first, and the master and apprentice work together to make the remaining parts. How long will it take to complete?
师徒二人合做446个零件，师傅每时加工45个，徒弟每时加工38个．徒弟先做3时，师徒二人合做剩下的零件，还要多少时完成？
<gadget id="calculator">38 * 3</gadget>
<output>114</output>

<gadget id="calculator">446 - 114</gadget>
<output>332</output>

<gadget id="calculator">45 + 38</gadget>
<output>83</output>

<gadget id="calculator">332 / 83</gadget>
<output>4</output>

<result>4</result>