A kind of iron wire is 14 meters long and has a mass of 3.5 kilograms. Now this kind of iron wire is 60 kilograms. How many meters is it long? (Solve with ratio)
一种铁丝长14米，质量是3.5千克，现有这种铁丝60千克，长多少米？(用比例解)
<gadget id="calculator">14 * 60</gadget>
<output>840</output>

<gadget id="calculator">840 / 3.5</gadget>
<output>240</output>

<result>240</result>