Master Li processes a batch of parts at a rate of 60 per hour, which can be finished in 4 hours. This batch of parts is urgently needed now, and it is required to finish processing in only 3 hours. How many parts should Master Li process per hour? (Solve with ratio)
李师傅加工一批零件，每小时加工60个，4小时能加工完．现在急需这批零件，要求只用3小时加工完，李师傅每小时应加工多少个零件？(用比例解)
<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<result>80</result>