and B work together to make a batch of parts, and plan to finish it in 6 hours. Now, B will do it for 1.5 hours first, and A will join the cooperation. It will take (3/5) more hours to complete the task than planned. It is known that A can do it every hour 54 parts, how many parts are there in this batch?
甲、乙两人合做一批零件，计划6小时做完，现在由乙先做1.5小时后，甲再加入合做，完成任务比计划多用(3/5)小时，已知甲每小时做54个零件，这批零件一共有多少个？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1.5 / (3/5)</gadget>
<output>2.5</output>

<gadget id="calculator">54 * 2.5 * 6</gadget>
<output>810</output>

<result>810</result>