It takes (3/4) hours to finish homework every day, which is (1/6) hour faster than Lele, and (1/20) hours slower than Lele. How long did it take Huanhuan to finish homework?
天天用(3/4)小时做完家庭作业，比乐乐快(1/6)小时，欢欢比乐乐慢(1/20)小时，欢欢做完家庭作业用了多长时间？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(3/4) + (1/6) + (1/20)</gadget>
<output>29/30 = around 0.966667</output>

<result>29/30 = around 0.966667</result>