section of road can be repaired by Team A in 8 hours alone, by Team B in 10 hours, and by the two teams in 3 hours.
一段公路，甲队独做要8小时修完，乙队独做要10小时修完，两队合修3小时，还剩这段公路的多少没有修．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/40) * 3</gadget>
<output>27/40 = around 0.675</output>

<gadget id="calculator">1 - (27/40)</gadget>
<output>13/40 = around 0.325</output>

<result>13/40 = around 0.325</result>