There are two iron wires, the first one is 15.6 meters long, the second one is 1.4 times longer than the first one and 2.1 meters long, how many meters is the second one long?
有两根铁丝，第一根长15.6米，第二根比第一根的1.4倍还长2.1米，第二根长多少米？
<gadget id="calculator">15.6 * 1.4</gadget>
<output>21.84</output>

<gadget id="calculator">21.84 + 2.1</gadget>
<output>23.94</output>

<result>23.94</result>