Teacher Li wanted to type a paper of 3600 words, and she typed (2/5) of this paper in (2/3) hours. How many words does Mr. Li type per hour on average?
李老师要打一篇3600字的论文，她(2/3)小时打了这篇论文的(2/5)．李老师平均每小时打多少个字？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/5) / (2/3)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3_600 * (3/5)</gadget>
<output>2_160</output>

<result>2_160</result>