A bundle of lead wires is 30 meters long, the first time (1/3) of the full length is used up, and the second time (2/5) of the full length is used up. Which time to use more, how many meters?
一捆铅丝长30米，第一次用去全长的(1/3)，第二次用去全长的(2/5)．哪次用的多，多多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

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

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<gadget id="calculator">12 - 10</gadget>
<output>2</output>

<result>2</result>