It used to take 50 minutes for Master Li to go from A to B by bicycle, but now he can get there in 20 minutes by motorcycle. How much has his speed improved compared to before?
李师傅从甲地到乙地原来骑自行车要50分钟，现在骑摩托车20分钟就可到达，他的速度比原来提高了多少
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

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

<gadget id="calculator">(1/20) - (1/50)</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">(3/100) / (1/50)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>