In a cylindrical container with a bottom area of 300 square centimeters, there is a cylindrical iron rod with a height of 60 cm and a bottom area of 100 square centimeters. At this time, the water depth of the container is 50 cm. Now gently lift the iron rod 10 cm upwards, how many centimeters is the wetted part of the cylindrical iron rod exposed to the water?
在底面积是300平方厘米的圆柱形容器里，直放着一个高是60厘米，底面积是100平方厘米的圆柱形铁棒．这时容器的水深50厘米．现将铁棒轻轻地向上方提起10厘米，露出水面的圆柱形铁棒浸湿部分长多少厘米？
<gadget id="calculator">300 - 100</gadget>
<output>200</output>

<gadget id="calculator">10 / 200</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">100 * (1/20)</gadget>
<output>5</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<result>15</result>