There are two iron wires, one is 10.8 meters long and the other is 7.2 meters long. After using up the same length of both wires, the remaining length of the short wire is 25% of the remaining length of the long wire. How many meters is the length of the piece of iron wire?
有两根铁丝，一根长10.8米，另一根长7.2米，两根都用去同样多的一段后，短的那根剩下的长度是长的那根剩下长度的25%，每根铁丝用去的那一段长多少米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">10.8 * (1/4)</gadget>
<output>2.7</output>

<gadget id="calculator">7.2 - 2.7</gadget>
<output>4.5</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">4.5 / (3/4)</gadget>
<output>6</output>

<result>6</result>