From A to B, if there are more lines (1/8) per hour, you can arrive 2 hours earlier. How many hours will it take to travel from A to B at the original speed?
从甲地到乙地，如果每小时多行(1/8)，则可以提前2小时到达．按原来速度从甲地到乙地需多少小时？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 + (1/8)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">1 / (9/8)</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 - (8/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">2 / (1/9)</gadget>
<output>18</output>

<result>18</result>