Aunt Li typed a 1,500-word manuscript, and typed all of it (2/5) in the first hour, and typed the first hour (3/4) in the second hour. How many words did you type in the second hour?
李阿姨打一份1500字的稿件，第一小时打了全部的(2/5)，第二小时打的是第一小时的(3/4)．第二小时打了多少字？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1_500 * (2/5) * (3/4)</gadget>
<output>450</output>

<result>450</result>