Two teams work together to build a canal. Team A has completed (1/2) an additional 7.2 kilometers, and Team B has repaired (1/3) the length of Team A. How long is this canal in kilometers?
两队合修一条水渠，甲队修完全程的(1/2)还多7.2千米，乙队修的相当于甲队的(1/3)．这条水渠全长多少千米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) * 7.2</gadget>
<output>2.4</output>

<gadget id="calculator">7.2 + 2.4</gadget>
<output>9.6</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/3) * (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/2) - (1/6)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">9.6 / (1/3)</gadget>
<output>28.8</output>

<result>28.8</result>