One day, the area where Li Li's home is located suffered a power outage due to power grid renovation, and there was no call at night. Li Li lit two candles, one 10 cm long and the other 7 cm long. After a while, the electricity came. Li Li cheered and blew out the candles. She found that the burnt parts of the two candles were the same length. The remaining length of the short one is (2/5) of the remaining length of the long one. How many centimeters are burned for each candle?
某日，李丽家所在地区由于电网改造停电，到晚上还没来电．李丽点燃了两根蜡烛，一根长10厘米，一根长7厘米，过了一会儿，电来了，李丽欢呼一声后吹灭蜡烛，她发现两根蜡烛燃掉的部分一样长．短的一根剩下的长度是长的一根剩下的长度的(2/5)，每根蜡烛各燃掉多少厘米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 10</gadget>
<output>4</output>

<gadget id="calculator">7 - 4</gadget>
<output>3</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">3 / (3/5)</gadget>
<output>5</output>

<result>5</result>