bundle of iron wires weighing 600 kilograms was bought at the construction site of Zhenhai Xincheng Haishang Plaza. Master Zhang cut off 30 meters and weighed 7.5 kilograms. How long is this bundle of wire? (Solve with ratio)
镇海新城海尚广场建筑工地上买回一捆铁丝重600千克，张师傅剪下30米，称得重7.5千克．这捆铁丝原来长多少米？(用比例解)
<gadget id="calculator">7.5 / 30</gadget>
<output>0.25</output>

<gadget id="calculator">600 / 0.25</gadget>
<output>2_400</output>

<result>2_400</result>