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`2/5` of a rectangular glass tank which is 60 cm long, 30 cm wide and 15 cm high is filled with water.
Luke transfers some of the water from the glass tank into a drum until it is filled to the brim.
As a result, 4.752 litres of water are left in the glass tank.
The perimeter of the rectangular base of the drum is 120 cm.
The ratio of its length to its breadth is 3 : 2.
Find the height of the drum.