A 6.4-kilometer-long canal is trapezoidal in cross section, 1.6 meters deep, 2.4 meters wide at the bottom, and 1.4 meters wide at the mouth. What is the cross-sectional area of the canal in square meters?
一条长6.4千米的水渠，横截面是梯形，渠深1.6米，渠底宽2.4米，渠口宽1.4米．水渠的横截面面积是多少平方米？
<gadget id="calculator">2.4 + 1.4</gadget>
<output>3.8</output>

<gadget id="calculator">1.6 / 2</gadget>
<output>0.8</output>

<gadget id="calculator">3.8 * 0.8</gadget>
<output>3.04</output>

<result>3.04</result>