Straighten a rope less than 6 meters long. If you measure from one end to 3 meters and make a mark A, and then measure from the other end to 3 meters and make a mark B, the distance between A and B is exactly 25% of the total length. How long is the rope in meters.
把一根不足6米的绳子拉直，如果从一头量到3米做一记号A，再从另一头量到3米做一记号B，AB间的距离恰好占全长的25%，这根绳子全长多少米．
<gadget id="calculator">3 + 3</gadget>
<output>6</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">6 / (5/4)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>