cube of iron with the sum of sides of 60cm is forged into a rectangular iron bar with a width of 5cm and a height of 10cm. How long is the iron bar in centimeters?
把一个棱长和为60cm的正方体铁块，锻造成宽为5cm，高为10cm的长方体铁条，这块铁条长多少厘米？
<result>2.4</result>