A and B walk the same distance, A takes 40 minutes and B takes 50 minutes, so how much faster is A than B?
甲乙走同一段路，甲要40分钟，乙要50分钟，那么甲的速度比乙快多少
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/40) - (1/50)</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">(1/200) / (1/50)</gadget>
<output>1/4 = around 0.25</output>

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