On Xingfu Avenue in Xincheng District, car A travels in 15 minutes and car B in 12 minutes, so how much faster is the speed of car B than car A?
新城区幸福大道，甲车15分钟行完，乙车12分钟行完，那么乙车的速度比甲车快多少．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/12) - (1/15)</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/60) / (1/15)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>