It takes Team A 10 days to build a road and Team B 15 days to finish it. How much faster is Team A than Team B?
修一条路，甲队要10天修完，乙队要15天修完，甲队的速度比乙队快百分之几？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">(1/10) - (1/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) / (1/15)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>