A, B, and C are running a race, A is faster than B (1/10), and C is slower than B (1/10). How many times faster is A than C?
甲、乙、丙三人赛跑，甲比乙快(1/10)，丙比乙慢(1/10)．甲的速度是丙的多少倍？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10)</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(11/10) / (9/10)</gadget>
<output>11/9 = around 1.222222</output>

<result>11/9 = around 1.222222</result>