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Cistern X with dimensions 45 cm in length, 25 cm in width and 90 cm in height was filled with kerosene to a level 10 cm below the top surface.
`1/2` of this volume was transferred to cistern Y such that 8 litres of kerosene overflowed.
The dimensions of the base of cistern Y were 40 cm by 25 cm.
Determine the height of cistern Y.