Hello..! :)
The time it takes to fill is 133 seconds or 2.21 minutes.
Step-by-step explanation:
First we have the expense that has been 60 L/s, now the tank has a capacity of 8 m³.
C = (8 m³) • (1000 L/ 1 m³)
C = 8000 L
Then we clear the time.
t = 8000 L/ ( 60 L/s)
t = 133s
We convert to minutes.
t = (133s) • (1min/ 60s)
t = 2.21min
¿Doubts? On the comments. Greetings :D