A rope is divided into two sections A and B. Section A is (2/5) longer than section B, and section B is (3/4) meters longer. Find the length of this rope.
一根绳分成甲乙两段，甲段比乙段长(2/5)，乙段长(3/4)米，求这根绳长．
<gadget id="calculator">27 / 20</gadget>
<output>27/20 = around 1.35</output>

<gadget id="calculator">15 / 20</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(27/20) + (3/4)</gadget>
<output>21/10 = around 2.1</output>

<result>21/10 = around 2.1</result>