A lead wire used up 2.4 meters for the first time, 0.4 meters less than the second time, and 1.4 meters more for the third time than the second time, how many meters was used for the third time?
一根铅丝，第一次用去了2.4米，比第二次少用去0.4米，第三次比第二次多用1.4米，第三次用去了多少米？
<gadget id="calculator">2.4 + 0.4</gadget>
<output>2.8</output>

<gadget id="calculator">2.8 + 1.4</gadget>
<output>4.2</output>

<result>4.2</result>