A piece of iron wire is 90m long. The first time uses up (1/2) of the full length, and the second time uses up (1/5) of the first time. How many meters is used in the second time?
一根铁丝长90m，第一次用去全长的(1/2)，第二次用去第一次的(1/5)，第二次用去多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">90 * (1/2) * (1/5)</gadget>
<output>9</output>

<result>9</result>