Cut a rope into two sections, the first section is 3.5 meters long, the second section accounts for 3/8 of the total length, how many meters is the second section long?
把一根绳子剪成两段，第一段长3.5米，第二段占全长的(3/8)，第二段长多少米？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">3.5 / (5/8)</gadget>
<output>5.6</output>

<gadget id="calculator">5.6 * (3/8)</gadget>
<output>2.1</output>

<result>2.1</result>