There are two bundles of iron wires of the same thickness. One bundle of iron wires is 8 meters long and weighs 400 kilograms. The other bundle of iron wires weighs 20 kilograms. How long is the bundle of iron wires?
有两捆粗细相同的铁丝，其中一捆铁丝长8米，重400千克，另一捆铁丝重20千克，这捆铁丝长多少米？
<gadget id="calculator">400 / 8</gadget>
<output>50</output>

<gadget id="calculator">20 / 50</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>