There are two ropes. The length of the first rope is 68.6 meters, which is 3.5 times the length of the second rope. How many meters is the length of the second rope?
有两根绳子，第一根长68.6米，是第二根绳长的3.5倍，第二根绳子长多少米？
<gadget id="calculator">68.6 / 3.5</gadget>
<output>19.6</output>

<result>19.6</result>