Rewrite the question so that it makes sense. Fix any grammar or spelling errors. Remove phrases that are not part of the question.

8) To fill a tank to a height of 80 cm, it took adding water at a rate of 20 liters per minute for 1 hour and 20 minutes. How long will it take to fill another tank to a height of 90 cm if water is added at a rate of 10 liters per minute?

Sure, let's solve this question step-by-step.

1. Initial conditions:
- We need to fill the first tank to a height of 80 cm.
- The rate of filling is 20 liters per minute.
- The time taken is 1 hour and 20 minutes.

2. Convert time into minutes:
- 1 hour = 60 minutes
- Additional time = 20 minutes
- Total time = 60 minutes + 20 minutes = 80 minutes

3. Calculate the total volume of water:
- Volume = fill rate × time
- Volume = 20 liters/minute × 80 minutes
- Volume = 1600 liters

4. New conditions to solve:
- We need to fill the second tank to a height of 90 cm with a filling rate of 30 liters per minute.

5. Comparing the heights:
- To find out how much more we need to fill compared to the initial tank height of 80 cm:
- Ratio of final height to initial height = 90 cm / 80 cm = 1.125

6. Calculate the new total volume needed:
- Final volume = Initial volume × (New height / Initial height)
- Final volume = 1600 liters × 1.125
- Final volume = 1800 liters

7. Calculate the time needed to fill to the new height at the new rate:
- Time = Final volume / New fill rate
- Time = 1800 liters / 30 liters per minute
- Time = 60 minutes

Summarizing:
- The initial conditions required 80 minutes to fill a tank with 1600 liters.
- To fill another tank to a height of 90 cm, it would need a total of 1800 liters.
- At a rate of 30 liters per minute, it would take 60 minutes to fill the second tank.

Therefore, it will take 60 minutes (1 hour) to fill the second tank to a height of 90 cm with a filling rate of 30 liters per minute.