A wooden cube of side 10 cm and density 900 kg/m³ floats upright in a beaker that holds water with a layer of oil on top. With the cube in place, the oil layer is 3.0 cm thick. The cube's bottom face is in the water and its top face is above the oil. The densities of water and oil are 1000 kg/m³ and 800 kg/m³. How far below the boundary between the oil and the water is the bottom face of the cube?

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A wooden cube of side $10\ \text{cm}$ and density $900\ \text{kg/m}^3$ floats upright in a beaker that holds water with a layer of oil on top. With the cube in place, the oil layer is $3.0\ \text{cm}$ thick. The cube's bottom face is in the water and its top face is above the oil. The densities of water and oil are $1000\ \text{kg/m}^3$ and $800\ \text{kg/m}^3$ . How far below the boundary between the oil and the water is the bottom face of the cube?

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