There are 240 parts, which are equally distributed to two workshops A and B for processing. Workshop B has an urgent task, so it starts to process these parts 4 hours after workshop A starts processing, and completes the task 40 minutes later than workshop A. It is known that the efficiency of workshop B is three times that of workshop A, so how many parts can workshop A process per hour?
有240个零件，平均分给甲、乙两个车间加工．乙车间有紧急任务，因此在甲车间开始加工了4小时之后才开始加工这批零件，而且比甲车间晚40分钟才完成任务．已知乙车间的效率是甲车间的3倍，那么甲车间每小时能加工多少个零件？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 - (2/3)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(10/3) / (2/3)</gadget>
<output>5</output>

<gadget id="calculator">240 / 2 / 5</gadget>
<output>24</output>

<result>24</result>