Master Zhang processes a batch of parts. He plans to make 6 parts per minute. Due to the urgent task, he actually makes 8 parts per minute. The result is 30 minutes less than the plan. How many parts are there in this batch?
张师傅加工一批零件，计划每分钟做6个，因任务紧迫，实际每分钟做8个，结果比计划少用30分，这批零件一共有多少个？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">(1/6) - (1/8)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">30 / (1/24)</gadget>
<output>720</output>

<result>720</result>