`5/8` of a steel tank which is 100 cm long, 55 cm wide and 30 cm high is filled with oil.

Ray transfers some of the oil from the steel tank into a glass tank until it is filled to its brim.

4.725 litres of water are left in the steel tank.

The perimeter of the rectangular base of the glass tank is 280 cm.

The ratio of its length to its breadth is 4 : 3.

Find the height of the glass tank.

Notes to students:

1. Round your answer off to 2 decimal places