The volume of a cuboid fuel tank is 216 cubic decimeters. Pour this whole tank of oil into another cuboid fuel tank with a larger volume. It is known that the length of the cuboid fuel tank is 9 decimeters and the width is 6 decimeters. What is the depth of the oil in the cuboid fuel tank? decimeter?
一个正方体油箱的容积是216立方分米，把这一整箱油倒入另一个容积更大的长方体油箱内，已知长方体油箱长9分米，宽6分米，则这个长方体油箱中油深多少分米？
<result>4</result>