From point A to point B, it takes 3 hours for car A and 4 hours for car B, how much faster is car A than car B
从A地到B地，甲车要3小时，乙车要4小时，甲车比乙车快多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) / (1/4)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>