There is a bundle of iron wire. (2/5) of it is used for the first time, (1/3) of it is used for the second time, and 40 meters are used for the third time. It just runs out. How long is the bundle of iron wire in meters?
有一捆铁丝，第一次用去它的(2/5)，第二次用去它的(1/3)，第三次用去40米，正好用完，这捆铁丝长多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">40 / (4/15)</gadget>
<output>150</output>

<result>150</result>