A 16-meter-long steel pipe, after using up (3/4), still weighs (2/5) tons. According to this calculation, how many tons does each meter of steel pipe weigh?
一根16米长的钢管，用去(3/4)后，重量还剩(2/5)吨．照这样算，每米钢管重多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) / (1/4) / 16</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>