A batch of parts is divided into 3 parts on average, and A, B, and C are completed separately. As a result, A is completed 30 minutes earlier than B, and B is completed 30 minutes earlier than C. It is known that A does 6 more than B per hour, and B does 3 more per hour than C. Find the number of parts in this batch.
一批零件平均分成3份，分别由甲乙丙三人单独完成，结果甲比乙早三十分钟完成，乙比丙早三十分钟完成．已知甲比乙每小时多做6个，乙比丙每小时多做3个．求这批零件的个数．
<gadget id="calculator">9 * 120</gadget>
<output>1_080</output>

<result>1_080</result>