A cuboid iron box filled with water has a bottom area of 60 cm2, a height of 10 cm, and a depth of 6 cm. A cylindrical iron block with a bottom area of 12 square centimeters is placed vertically in the water, and part of it is still above the water surface. What is the depth of the water in cm?
一只装有水的长方体铁盒，底面积是60平方厘米，高是10厘米，水深6厘米．现将一个底面积是12平方厘米的圆柱形铁块竖放在水中，仍有一部分露出水面，这时铁盒的水深是多少厘米．
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