To produce a batch of parts, A makes 30 parts per hour; B alone makes 8 hours to complete. Now A and B are working together. When the task is completed, the number of parts made by A is B's (3/5). How many parts are there in this batch?
生产一批零件，甲每小时做30个；乙独做8小时完成．现甲、乙两人合做，完成任务时，甲做的零件数是乙的(3/5)．这批零件共有多少个？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">1 / (8/5)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(5/8) / (1/8) / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(5/8) / (1/8) / (3/8)</gadget>
<output>40/3 = around 13.333333</output>

<gadget id="calculator">30 * (40/3)</gadget>
<output>400</output>

<result>400</result>