In a relay race, the first leg runs (3/5) kilometers, the second leg runs (7/10) kilometers, the third leg runs (11/20) kilometers, and the last leg runs ( 9/20) kilometers, how many kilometers are there in total?
在接力赛中，第一棒跑了(3/5)千米，第二棒跑了(7/10)千米，第三棒跑了(11/20)千米，最后一棒跑了(9/20)千米，请问全程共有多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">11 / 20</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(3/5) + (7/10) + (11/20) + (9/20)</gadget>
<output>23/10 = around 2.3</output>

<result>23/10 = around 2.3</result>