There are four colored ribbons, red, yellow, blue, and green. The red ribbon is (2/5)m longer than the yellow ribbon, the blue ribbon is (1/10)m longer than the green ribbon, and (3/4)m shorter than the red ribbon. Which color ribbon is the longest? Which color ribbon is the shortest? How many meters is the difference between the two?
有红、黄、蓝、绿四根彩带，红彩带比黄彩带长(2/5)m，蓝彩带比绿彩带长(1/10)m，比红彩带短(3/4)m，哪种颜色的彩带最长？哪种颜色的彩带最短？二者相差多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(2/5) - (3/4) - (1/10)</gadget>
<output>-9/20 = around -0.45</output>

<gadget id="calculator">1 + (-9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(2/5) - (11/20)</gadget>
<output>-3/20 = around -0.15</output>

<gadget id="calculator">1 + (-3/20)</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>