project is divided into 3 parts on average, and A, B, and C are completed respectively. It is known that A is completed 30 minutes earlier than B, and B is completed 30 minutes earlier than C. Make 3 more parts, and find out how many parts there are in this project.
一项工程平均分成3份，分别由甲乙丙三个各自完成，已知甲比乙提前30分钟完成，乙比丙提前30分钟完成，甲每小时比乙多做6个，乙比丙每小时多做3个，求这项工程一共有多少个零件．
<gadget id="calculator">9 * 120</gadget>
<output>1_080</output>

<result>1_080</result>