Xiao Ming used to spend (2/5) hours practicing brush calligraphy, but after becoming proficient, he can complete daily practice in only (1/4) hours. How much time is saved every day now compared to the original?
小明原来要用(2/5)小时练习毛笔字，熟练后，只用(1/4)小时就能完成每天的练习．现在比原来每天节省多少时间？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>