Question 1168097
pool 1 has 980+20.25x, x=minutes
pool 2 is 44.75x
set them equal
980+20.25x=44.75x
980=24.5x
x=40 minutes

alternative way
the rate of change between the two is pool 2 is filling 24.5 liters per minute faster than pool 1.  It has to catch up 980 liters.  That will take 40 minutes.