An empty rectangular tank has a capacity of 59 ℓ and a height of 50 cm. At 8 a.m., Tap X is turned on to fill the tank at a rate of 10 ℓ per minute for 18 minutes. After 13 minutes, Tap Y is turned on to drain water from the tank at a rate of 3 ℓ per minute for 23 minutes. What is the height of the water level in the tank in the end? Give the answer in 1 decimal place.