Travel a certain distance, the bus travels (1/4) of this distance in the first hour, and (1/5) of this distance in the second hour, and there are still 11 kilometers away from the midpoint. How many kilometers is this road?
行一段路，客车第一小时行了这段路的(1/4)，第二小时行了这段路的(1/5)，距中点还有11千米．这段路长多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(1/2) - (9/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">11 / (1/20)</gadget>
<output>220</output>

<result>220</result>