A rope is 40 meters long, cut off (5/2) meters for the first time, and cut off the remaining (2/5) for the second time. How much rice was cut for the second time?
一根绳子长40米，第一次剪去(5/2)米，第二次剪去余下的(2/5)．第二次剪去多少米？
<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">40 - (5/2)</gadget>
<output>75/2 = around 37.5</output>

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

<gadget id="calculator">(75/2) * (2/5)</gadget>
<output>15</output>

<result>15</result>