For a cable, the full length (1/3) was used for the first time, and the full length (2/5) was used for the second time, leaving 80 meters. How long is this cable in meters?
一根电缆，第一次用了全长的(1/3)，第二次用了全长的(2/5)，剩下80米，这根电缆长多少米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">80 / (4/15)</gadget>
<output>300</output>

<result>300</result>