Right rectangular prism volume?

Am I crazy????

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The dimension of the base of a vessel in the shape of a right rectangular prism is 60cm x 45cm. Its height is 15cm. The vessel is filled half-full with water.

Estimate the side length of a solid iron cube which, when dropped into vessel, will raise the water level up to top of prism.

Answer choices were: 27.2, 27.3, 34.3, 34.4.

Please help understand how to solve this. Thanks!!!
 
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