If a rope is 40% shorter than 30% by 1.2 meters, how long is the rope?
量得一根绳子的四折比三折短1.2米，绳子长多少米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) - (1/4)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1.2 / (1/12)</gadget>
<output>14.4</output>

<result>14.4</result>